No, what you want to do is uninstall bootstrap, then install safestrap. but don't delete rom manager because you can still use it later. Here are the steps:
1. Download Alpha 10 zip, place on your SD card internal or external.
2. uninstall bootstrapper and install safestrap .apk
3. open safestrap apk and install recovery
4. reboot phone and press menu when prompted for safestrap recovery.
5. select Safe boot Menu and select toggle safe system and select yes.
This will back up your current system/rom and put you into safe mode. Meaning you can flash ICS and revert back to Liberty when your done without having to wipe and reinstall.
6. After enabling safe system, wipe data/cache
7. Advanced-->Wipe dalvick cache
8. Mounts and storage-->format/system
9. After this you can install the zip from your SD card. After installing, reboot system.
When your done playing around in the rom, reboot into safestrap and disable safe system.
10. Safeboot menu-->toggle safe system. Once that's done, you can reboot your system and you'll be back in Liberty.
Hopefully that makes sense.
Thanks! That really helps. Just few more questions to uninstall bootstap, I just delete the bootstrap.apk correct? And also, uninstalling bootstrap shouldn't affect liberty right? Otherwise I got it. Thanks. Will try it out