What year is your car? The metal ones (chromed stainless steel) , I believe mid 2017 on back, is held on by urethane in the quarter window area. From quarter window going forward it's held on with plastic clips & screws. And like Altes post, it's a once & done deal because the urethane just doesn't want to pull off cleanly. You'll like bend the molding trying to pull it off.
Now if you're talking about mid 2017 to now, it should be chrome plastic which is held in place by molded in clips & 3M tape in quarter window area. The rest is still with screws. This you should be able to pull off.