Just take your time trim slowly around the cut off area's.Only trick is have a bondo spreader or other small tool to push in down in the drip rail and leave at least 5/8 under the drip rail or it will be harder to hold down as the contact glue dries. I just use my hand mostly to smooth it its very easy to smooth the large area's it take's time in the small areas b/c you want to get it in pushed down good in the drip rail. It also takes some time to get the wiggles out of the lines (seam's) you just pull hard and look at it good so it's nice. 4hrs to 5 hrs of your time so it's nice. Jay