[Steve Tinker]

Doug,
1) I've re-used the original spring clips/pins etc 3 times now without a problem. Although I clean them up in turps and a wire wheel just to make sure of their integrity.
2) Once you have removed the old pads, you can push the pistons back with the end of the plastic covered channel lock pliers (as per Boxster586 above). I also loosen the brake fluid resevoir to make it a litte easier to push back the pistons - note that once the pistons are pushed back, the fluid in the resevoir rises, so watch the level.
3) The 2 small pad wear indicators can be a devil of a thing to remove if they have been in the old pads a long time - you may need long nosed tweezers or pliers to pull them out. Your new pads should have holes ready for the wear indicators, though some aftermarket pads don't....
4) You may have to prize off the steel plate thats glued to the back of the old pads - sometimes easily, sometimes not. I use an old thin paint scraper. If you don't remove the glued on plate, you can't pull the pads out. I reuse the old backing plate and glue on with a touch of heat res silicon.
Hope this helps.....