I had trouble putting mine back in once (with a backstrap that hadn't been on yet). Mine was fairly easy to move at first though (no tools needed). I am worried about the very small tab that locks it into place. I'm pretty sure I could twist that off in a heartbeat.
Yep, that's what the gun shop showed me. Only thing I'd add is that you should use a bit of gun lube on both the tool itself AND the holes/guides in the frame and the backstrap piece. With that, you can (just barely) twist it off with your hands (still hurts for a few seconds) but it is in NO WAY loose (which is what I worried about before I did it). Using a table as shown in the link gets much easier once you use a bit of lube.
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