On my Chevy 2010 Silverado crew cab, the window trim on the rear door, Part #1 in pic needs to be replaced. Near the top of the trim the trim broke and now lets water in. I bought the new trim, have looked on you tube and forums for days and can't find directions or videos on how to change it out. Do I need to take the inside of the door panel off to undo the clips on the old trim? I paid a lot for the new piece of trim and don't want to screw up how to install it. Any advice would be appreciated. Currently I put calk to keep it somewhat in place but that is a short term fix.