man, i just installed a new one in my project "brava-dime" (half bravada, half s-10) an hour ago, anyways it was fairly easy to do. removing it i used a windshield removal tool (listed below) and after the window was out i made sure the area was completely clean of all old caulking. used the black window caulk from autozone (like 11 bux or something) and put a 1/4" or so bead around the entire opening (being very careful you do not get it on anything else, it will not remove easily) and gently place the window into its new home. while the caulking is still wet, install the new window rubber trim above the window (if it has one) and secure it with tape and let it dry for at least over night. total time it took me (alone) was 45 minutes
http://buy1.snapon.com/catalog/item.asp?P65=&tool=all&item_ID=69032&group_ID=1785&store=snapon-store&dir=catalog