Most ppl fail doing this as they just yank em off and they bend.
Once this happens. say bye bye to your side mouldings.
Personally, I like them for road cars. Nothing worse then a trolley dent due to some twat in a carpark.
Tools
1 small hammer or rubber mallet
1 plastic scrapper/spatula (I used an old one from gyprocking some plater)
The reason for the plastic spatula is that over metal. You will be less likely to scrape the metal off your door.
Step 1. Insert spatula into side of door moulding
Step 2. Hammer Spatula
Step 3. Ease the rubber side moulding off slowly (not more then 2 inches/ 5cm )
Step 4. Repeat steps 1-3, slowly moving the spatula up as you get through it.
Notes: Be warey that previously resprayed cars may get some paint lift.
Do this at your own risk.
If anyone knows of a better way, please post it.