Disconnecting the battery? Radio Install

[deicustoms1]

Finally gathered all the parts to install my n2. Normally I wouldn't disconnect the battery to install a radio, but I've read warnings for the h3 that say do not disconnect the battery when installing, and do disconnect it when installing.

I'd do it with the battery connected, but thought I'd ask here before since I'm not sure with the mixed warnings and onstar and the airbags on the truck. thanks