Well the best way to replace the glass is to run a hook or a flat screwdriver carefully around the entire glass inside and out to losen the rubber. After that if the glass your removing is shot lay a heavy quilt or moving blanket over the hood and get inside and with both feet push it out..You may want to wear safety glasses and leg protection in case your foot goes through..Then check your rubber and make sure it is still soft if not GET A NEW ONE.. or you will break your new glass. Put the rubber onto the new glass all the way around clean the pinchweld on the truck and lube the rubber and pinch weld with something that will wash off with water like dishsoap or KY jelly put a small rope in the rubber where the pinchweld goes starting at the bottom going all the way around and ending at the bottom. Set the glass and rubber in the truck and get the bottom started on the pinchweld and have a buddy outside applying firm but gentle even pressure. and start pulling one end of the ropeand have your buddy follow you all the way around. With the right amount of pressure and pulling the rope you should see the rubber lapping over the pinchweld as you pull its called ropping a glass in..when you get to about the middle of the top of the glass start pulling the other end of the rope and meet at the top.. If you done it right presto its in.. if you run into a problem before you get to the top of the glass gently push it back out and start again. Dont bind the glass or you'll be buying another glass..If in doubt have a glass shop put it in..I should know i been doing glass for about 10 years now..ASG master tech..