However you would go about flashing an ICS rom would be the same process for a JB rom
just make sure you do a clean wipe before flashing (cache, dalvik, and factory reset). All your files (pictures, music, etc...) will be saved but it never hurts to make a backup. Just make sure you don't wipe your SD otherwise your files will be lost.
Also no one is really sure when developers will start pushing out our favorite roms including Sourcery, Liquid, AOKP, etc... So if you can handle the wait then you can, but at least a few weeks I'd say