diff --git a/src/commands/configureProjectCommand.ts b/src/commands/configureProjectCommand.ts
index 97a1426f..dd77130e 100644
--- a/src/commands/configureProjectCommand.ts
+++ b/src/commands/configureProjectCommand.ts
@@ -6,6 +6,8 @@
  */
 
 import { Uri, WebviewPanel, commands, window } from 'vscode';
+import * as process from 'process';
+import { CommonUtils } from '@salesforce/lwc-dev-mobile-core/lib/common/CommonUtils';
 import { InstructionsWebviewProvider } from '../webviews';
 
 export class ConfigureProjectCommand {
@@ -43,8 +45,10 @@ export class ConfigureProjectCommand {
                     {
                         buttonId: 'openExistingButton',
                         action: async (panel) => {
-                            const path = await this.openExistingProject(panel);
-                            return resolve(path);
+                            // See above for rationale for running this async.
+                            this.openExistingProject(panel).then((path) => {
+                                return resolve(path);
+                            });
                         }
                     }
                 ]
@@ -77,7 +81,7 @@ export class ConfigureProjectCommand {
                             panel.dispose();
                             try {
                                 const path = await this.executeProjectCreation(
-                                    folderUri
+                                    folderUri[0]
                                 );
                                 return resolve(path);
                             } catch (error) {
@@ -90,13 +94,50 @@ export class ConfigureProjectCommand {
         });
     }
 
-    private async openExistingProject(
-        panel: WebviewPanel
-    ): Promise<string | undefined> {
-        return new Promise((resolve, reject) => {});
+    private async openExistingProject(panel: WebviewPanel): Promise<string> {
+        return new Promise(async (resolve) => {
+            const folderUri = await window.showOpenDialog({
+                openLabel: 'Select project folder',
+                canSelectFolders: true,
+                canSelectFiles: false,
+                canSelectMany: false
+            });
+            if (!folderUri || folderUri.length === 0) {
+                return;
+            }
+
+            try {
+                await this.validateProjectFolder(folderUri[0]);
+            } catch (error) {
+                window.showErrorMessage((error as Error).message);
+                return;
+            }
+
+            panel.dispose();
+            new InstructionsWebviewProvider(
+                this.extensionUri
+            ).showInstructionWebview(
+                'Offline Starter Kit: Follow the Prompts',
+                'src/instructions/projectBootstrapAcknowledgment.html',
+                [
+                    {
+                        buttonId: 'okButton',
+                        action: async (panel) => {
+                            panel.dispose();
+                            await commands.executeCommand(
+                                'vscode.openFolder',
+                                folderUri[0],
+                                { forceReuseWindow: true }
+                            );
+                            return resolve(folderUri[0].fsPath);
+                        }
+                    }
+                ]
+            );
+        });
     }
 
-    private async executeProjectCreation(folderUri: Uri[]): Promise<string> {
+    private async executeProjectCreation(folderUri: Uri): Promise<string> {
         return new Promise(async (resolve, reject) => {
             const githubRepoUri: string =
                 'https://github.com/salesforce/offline-app-developer-starter-kit.git';
@@ -104,13 +145,71 @@ export class ConfigureProjectCommand {
                 await commands.executeCommand(
                     'git.clone',
                     githubRepoUri,
-                    folderUri[0].fsPath
+                    folderUri.fsPath
                 );
-                return resolve(folderUri[0].fsPath);
+                return resolve(folderUri.fsPath);
             } catch (error) {
                 window.showErrorMessage(`Failed to clone: ${error}`);
                 return reject(error);
             }
         });
     }
+
+    private async validateProjectFolder(projectFolderUri: Uri): Promise<void> {
+        return new Promise(async (resolve, reject) => {
+            const origWorkingDir = process.cwd();
+            try {
+                // Can we chdir to the selected folder?
+                try {
+                    process.chdir(projectFolderUri.fsPath);
+                } catch (error) {
+                    return reject(
+                        new Error(
+                            `Could not access the project folder at '${projectFolderUri.fsPath}'.`
+                        )
+                    );
+                }
+
+                // Is git installed?
+                try {
+                    // TODO: There are a number of complexities to solving
+                    // for this in the general platform case.
+                    // Cf. https://github.com/microsoft/vscode/blob/89ec834df20d597ff96f7d303e7e0f2f055d2a4e/extensions/git/src/git.ts#L145-L165
+                    await CommonUtils.executeCommandAsync('git --version');
+                } catch (error) {
+                    return reject(new Error('git is not installed.'));
+                }
+
+                // Is this a git repo?
+                try {
+                    await CommonUtils.executeCommandAsync('git status');
+                } catch (error) {
+                    return reject(
+                        new Error(
+                            `Folder '${projectFolderUri.fsPath}' does not contain a git repository.`
+                        )
+                    );
+                }
+
+                // Is this the Offline Starter Kit repo?
+                try {
+                    const oskInitialCommit =
+                        '99b1fa9377694beb7918580aab445a2e9981f611';
+                    await CommonUtils.executeCommandAsync(
+                        `git merge-base HEAD ${oskInitialCommit}`
+                    );
+                } catch (error) {
+                    return reject(
+                        new Error(
+                            'This git repository does not share history with the Offline Starter Kit.'
+                        )
+                    );
+                }
+
+                return resolve();
+            } finally {
+                process.chdir(origWorkingDir);
+            }
+        });
+    }
 }