How to change bezel on Rolex Datejust

The bezel is secured by a Teflon gasket. To remove the bezel I would use a watch knife and gently press it in between the bezel and the case. Make sure you go straight in and it might not be a bad idea to use a layer of plastic around the knife so it doesn't leave marks. Also, do not use a widling motion. GO STRAIGHT IN. This will also prevent damage to the case and bezel. Repeat this several times working your way around the bezel. Be sure you don't continue to apply pressure with the knife once the bezel begins to come up as you don't want to damage the Teflon seal. Once you have the bezel out you will need to replace the Teflon seal the exact same way it came off on your replacement bezel and press back into place.