i just use the Saw-z-all. This method also gets rid of that annoying metal that prohibits you from adjusting/changing electric window motors and door locks. lol
I must tell you, after adding Brown Bread to my panels (both the metal and the panel itself) the process of putting the panel back on takes MUCH longer (maybe 5-10 pissy minutes)...plus the fact that i have 2 broken clip retainers on my lower driver side panel and one ripped one on the upper doesn't help much either.