If it were me,I'd start at one end after having the truck parked in the hot sun with the fishing line. Then after I got a good edge up I'd CAREFULLY apply heat with the heat gun to the BACK of the molding between it and the door. GeT comfortable. Get a stool,provide yourself some shade,a cool drink and plenty of time.....you can do it. Use some GOOGONE or the like and have a bucket of soap and water on hand for clean up. Start with the smallest piece first then go from there. Good luck ,take pics.