I have installed several of these myself- the XPEL product. The first one I did myself I had to re-do. The second one I had to piece together becuase I aligned it wrong on the hood. The third one went reasonably smooth. The fourth and fifth went near perfect. There is a severe learning curve here- If you aren't going to do a few, let someone with some experience do it. You can go to
www.xpel.com and look at the pricing for the materials, and every item has a "star" rating for difficulty. Anyone can put on a 1 star unit, 3-4 stars get tricky to manage.
The up-side is that the damn things work! I had my first one on a Grand Cherokee, and the leading edge of the hood had NO damage after 80000 miles.
FYI the raw materials not including install will cost approx $320 for an '02 X5 3.0.