As long as you don't do a factory reset through your phone, its very simple to get out of brick/bootloop, just like posted above, make a backup once you get a recovery installed, rom manager is a simple way to do it. Alaso if you can't get your phone to boot after flashing a rom, turn your phone off and while holding the volume down and home key, power up your phone, it will boot in to recovery, and you can restore a backup from there