i presume you mean the wood trim molding surrounds?
1. drill out rivets at corners etc hidden under the little plugs & keep those plugs for later
2. warm the vinyl up with a blow heater (or just do it during summer months) - the warmth stops the vinyl from warping or cracking under duress
3. push along under the trim with a plastic putty knife, gently warming & lifting as you go along
4. as you remove/release a small section at a time, push it back onto the body just so that it adheres enough to stay flat, not hang of the body & become disfigured
5. when its all released then lay it flat
6. citrus cleaner can help get the adhesive off the back side - but its takes time to get all of the residue off
7. reinstall 3m brand type double sided adhesive tape on the back side - auto panel body shops can point you in the right direction, it will be the same stuff they use today to install side moldings etc - but better than what jeep used back in the day.
i plan to reinstall my trim later this year after a respray - good luck.
Black Cherry 1989 Grand Wagoneer
S&J rebuilt AMC360
IMPCO Petrol / Propane