There's more than one way to do this. I would not use Titanium Backup for this. Replacing the stock launcher can cause force close errors which can make getting to the Titanium Backup app impossible. I mean... think about it... you're deleting the launcher - and you use the launcher to launch Titanium Backup. ADB is most likely the best method to get this done, however a file manager such as Root Explorer will also do the job.

This didn't work for me initially, because I only had the stock TouchWiz launcher installed. The best way to get this installed is to have an alternate launcher installed, such as Launcher Pro. You also must have root access to your phone. I'm not responsible for what you do.

- If you only have the stock launcher installed, install an alternate such as Launcher Pro from the Market.
- If you have multiple launchers already, make sure TwLauncher is NOT the default. Clear the default by going to Settings > Applications > Manage Applications > *whatever launcher you use* > Clear Defaults
- Make Launcher Pro your current launcher - if the TouchWiz Launcher is active, you will have problems
- Copy the TouchWiz30Launcher.apk to your SD card (I put mine in my /sdcard/download/ folder - this is where I keep downloaded .apk files)
- Make a backup (COPY) the original Verizon TouchWiz30Launcher files (I copied /system/app/TouchWiz30Launcher.* to /sdcard/bacukp/app-del/ - this is where I keep all the stock bloatware files; I keep them there just in case... that's why you'll never see me post "help!! I deleted this file and I need it back!")
- Copy the new TouchWiz30Launcher.apk file from /sdcard/download/ to /system/app/ - overwriting the original one - make sure you backed this file up first!!
- Delete the /system/app/TouchWiz30Launcher.odex file - make sure you backed this file up first!!
- Reboot the phone

If you cleared the launcher defaults, it should ask which launcher you want to use after you unlock your phone. The Vibrant Launcher should now work. I don't see how to change the dock other than to edit the .apk directly. The alphabetical grid is option is there and the settings (gear) button isn't - you know, the one that lets you edit home screens and stuff. Those are the only differences I notice.

The instructions above should allow you to use ADB or a file manager. As long as you read them and you understand what you're doing, you should be okay.