Winshield replacement time

[Racer2172]

I am getting ready to get the windshield changed in my 72 k-20. What is the difference in the gaskets, trim vs/no trim. I am guessing the chrome trim around the windshield. Has any changed their own windshield before? I have a cab with good windshield in it just a little hesitant to try it myself. Any tips or pointers? Talked to a local glass company They quoted around 160 to remove the old, replace the gasket and install my parts truck spare. Its a mom and pop place that seems to know what they are doing. But Im cheap and would like to save a few bucks if i can.