An easy trick to trim off excess dough is to let it hang over the tart pan and run the rolling pin over the top. (holajalapeno.com)
I had to trim off about 1/4 ″ from my doors on the top and bottom (for my bedroom closet) and it didn't cause any imperfections. (shadesofblueinteriors.com)
If you end up with any green parts attached to the gel, just trim them off with a pairing knife! (intothegloss.com)