I did a evaporator on a 1989 mustang GT once, I had to take the whole dash board out. Not too bad for my first one. Went to Midas for the mechanic to refill the system with freon and he was amazed i did it myself for the 1st time. But that was a mustang, i'm sure the truck is a different story.
John 3:16 " For God so loved the world, He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life."