If the wagon has Customline trim, all of the trim can be easily removed from outside by popping the trim off its clip with a screwdriver. I used a screwdriver that had been ground down so the blade was sharp. If it has Fairlane trim it is the same as the Customline except for the front doors and fenders. The "Vee" on the doors hace a special clip which needs to be remove from inside the door. Fender trim must be removed by attacking from underneath also. Both the Customline and Fairlane series cars have ONE clip on each side at the very back which must be unscrewed from inside the trunk. If the wagon has the simulated wood trim, I dont know how those come off.
To remove window trim on all models, you need to pop out the window glass and gasket. Once the window is out, you pull the rubber apart to pull the trim out of the rubber gasket