Very carefully !!!!!!! It depends whether or not you're trying to save the glass and/or rubber. It can be cut out and replace with a new rubber, the safest. Try to loosed the seal between the rubber and the body, usually with some kind of hook tool then gently and evenly press on glass and slowly work it out. When re-installing place the rubber around the glass, then insert the stainless trim. Or take to a glass shop and let them do it.