I would start by covering the sides to just above the top of the horziontal stab. Then work on one side, and start from just ahead of the vertical flare into the fuselage and back to the end of the fuselage. Use a lot of hang over and work it similar to a wing tip. When you start to make the curve over, cut the covering in 1" strips within a 1/2" of the LE edge of the vertical. You can then slowly heat and pull it into place. If you stop the covering just past the LE, you can then cut a strip about 3/8" wide, or what ever the width of the vertical is, and cover the LE after both sides are down. The thin strip will hide the seam between the two sides.

I would suggest Oracoat or one of the light weight coverings used for gliders. I'm not sure the brand, as I aquired several partal rolls in a lot of stuff I bought from a local guy. That stuff is increadable for working curves, it sticks like you wouldn't believe and is really quite tough. I used it on the wing tips of a Pheonix Fun Star that I recovered and the wing is really thick airfoil and a compound rounded tip with exposed ribs and stringers that doesn't give you a single flat spot I just covered the tip then covered the wing surface after. I've had to repair it twice due to tip contact with the runway and it was a real pleasure to work with. I'll try to find the brand. It has a clear plastic edge on the covering and a light weight weight clear plastic backing.

Don