Questions Regarding the Replacement of My Rear Window Trim

[Rigger Jim]

I have a 1995, 240SX. First, I would like to describe the particular part of the vehicle I am dealing with. I don't know the exact name of the part. But, it is the rubber trim runs along the edge of the rear window. The window lays on the weatherstripping and this trim covers the weatherstripping up. I'm also aware that the rear window has a 2-piece set of trim. Okay, now to my actual problem. My trim, in the area described, is peeling off. I only need to replace the trim that covers the sides and top of the rear window. I paid a dealer $30 for the replacement part for the sides and top. I want to know if anyone on here has carried out this particular procedure, is it difficult, and where can I find some instructions on how to replace this trim. All help is greatly appreciated.