Wild Foamy,
Don't worry about screwing up the covering, you can always rip it off and start over if its not right. Start with the transparent first, cover the wing as you would any other aircraft. You want to precut the top covering before you put it on the plane. I used a piepan to get the curves, and put them on in pieces. Just take your time and you'll have no problems.

You may get a few bubbles, just take your time and work them out.

Again, if you start with the transparent and cover the entire wing (top and bottom at once) and shrink it in stages (starting from the wingtips and slowly working your way in switching from side to side) you'll have no problems with warping.

Here are pics of the top and bottom. By the way this REALLY stickes out in the air!