Vinyl Door Trim on 2009 Enclave
 

I have a 2009 Enclave. The semi gloss black trim around the window on the driver's side rear door is starting to peel where the tape(?) makes the tight bend toward the window glass. I am looking for advice on how to replace it, where I can get new material and how to remove the old trim. Any help is greatly appreciated, thanks in advance!

Jim