I installed these without any prior experience and they came out great. I used the stickerfab felt squeegee and it helped push the vinyl around and remove any bubbles. I suggest that you don't follow all of the instructions on the product page though. Specifically the order to install everything. If you install the small separate piece near the inside of the fake door intake first, then you can hide all of the edges with the larger vinyl piece and the install will beuch more simple.
I had lots of trouble with the front of the door, where it comes to a point. In the end I just used a razor to slit it a couple times and then pushed each piece around the edge. It isn't perfect and I hope it holds over time.