I have a 83 chevy 3/4 ton with a cracked windshield. Any tips on changing it out? It "looks" like the skinny rubber piece in the middle of the seal on the outside pulls out. Once that is out, is it just a matter ofpushing the old window out and plopping the new one in? Sounds simple if so, but I know how things go in real life! Any words of wisdom for me? Thanks, Earl