Once the trim was in place, I used a rubber mallet (and at times a wood block) to mold the side edge into position.

I never hit the trim very hard... it bends easily once it has been annealed. After I was satisfied with the shape, I removed the trim and applied GE Gray Poly caulk to the top and side of the trim and reapplied it. Be liberal with the caulk here, you don't want leaks.
Smoothing Out the Edge Trim