Replacing car door seals

I’m looking for tips in replacing car door seals. I will soon be replacing the seals on a 2003 Chrysler Town & Country for the left and right sliding doors and moving on to the two front doors. I was hoping to get some insight to tricks or pitfalls to look for in doing the job.

The only tips I can think of giving are,when you think the seal is to long and must be trimmed,dont, and don’t use any glue to hold the seal to the body.