I just changed my pads on my AE92 SX over the weekend. It only took about 3 hrs, and most of that was figuring out how to do it. Should get it down to about 30 - 45 min, which will be good at the track.
I fitted EBC Green Stuff's at the front and EBC street Kevlar's at the rear. Not cheap but should be worth it. Will fill in once I have run at Phillip Island in a few weeks.
The hardest part was putting the rear piston back in. It has to be turned. Needle nose pliers worked alright, just becareful as you could damage the seal.