We can change a set on a 99ZR AND an 02' XC in about 15-20 mins not in much of a rush. Usually tip the sled on it's side, remove screw, hit front with big screwdriver and an even bigger hammer a little at a time. Make sure the tail end of it lines up with a hole in the track and away you go. With a little lube in the slides you can usually yank them out by hand once they are about halfway out. Turn sled on other side, rinse, repeat.