A PSP-1000 can be used to create a Pandora Battery from a normal Sony battery. If the PSP still has its original 1800mAh battery, it's a good excuse to buy a new high-capacity battery and pandorize the old one.
The good news is that custom firmware has gotten to the point that bricking a psp involves an act of stupidity.
Don't run any strange apps, and you should be fine.
Most of the time, when something messes up, the recovery console can be used to, uh, recover the system:
http://alek.dark-alex.org/pspwiki/in.../Recovery_Menu
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