Are you refinishing just the slide and barrel (made of steel), or the frame, too (made of aluminum, usually considered much harder to refinish)? A normal field-strip will get you almost far enough to do the slide and barrel (may have to detach the barrel from the frame at the pivot). Getting the guts out of the frame (and back in, later) is a much greater challenge. Unless the frame is really bad, I'd recommend just using a touch-up product, so a full detail-strip would not be needed.
Maybe one of these two video clips would be helpful (looks like field-strip help only):
Beretta Model 21A Bobcat : Disassembly & Cleaning - YouTube