If you use yogi4's tutorial in the" all things root " sub forum you will be able to install a custom recovery and any Gingerbread ROM you want. This tutorial is all about how to use ROMTools, that will allow you to do those things mentioned,but, it will use a temporary root that goes away at the first reboot. This tutorial is very informative and designed specifically for new members that don't know a thing about how to do the things mentioned. Using this tutorial is easy and is spelled out so well that you should not be able to mess anything up.