This is the way I do it all the time, be sure to have the tape so it doesn't mark the trim. I remember as a kid, I saw it on the Tech section in Hot Rod magizine.One of those cheap can openers with a little masking tape around it. Just go a little at a time.
http://www.foodservicewarehouse.com...rce=googleps&gclid=CM23krj91LgCFSdp7AodF0kA1w
This!A little block of wood, then tap tap tap from underneath.