I have an 04, but the 01 should be the same. The rear pads need to be pushed/screwed back in. You should rent the tool for this at the auto store. Also when you turn it, make sure you turn it to the right position so that when you place the new pad in, the little peg on the pad aligns with the piston.
Also, if you are taking off the rotors, you might need to disconnect the parking brake setup on the passenger side. I didn't know it comes off at first so I ended up barely getting a bolt out and it took forever.
-Mac CAI, 73mm Mass Air
-Dual Flowmaster 40s, H pipe, 2.25 in pipe
-42% Underdrive Pulleys
-4.10 Gears & Trac-lok