Pencero is correct in a way. Body work really is an art in itself and it takes years of experience and practice to know what you're doing. Bodywork is also completely different today than it was 25 years or so ago. 25 years ago body work was pounding out fenders, brazing pinholes and painting in lacquer. Anymore bodywork is just knowing how to take cars apart and how to paint, all body men do anymore is change parts and paint them. Dents aren't pounded out, rather the panel is just replaced. Parts are painted in Urethane and now some shops are converting to water-based.
Anyway to remove the drip rails, you have to pull out the weatherstrip door seal, and there are screws inside the rail that holds the weatherstrip in. Take those screws out, remove the rail, and there are more screws behind that rail that hold the actual drip rail in. Take those screws out, and then the drip rail should be able to be popped out.