My recomendations:

1. Buy a brand new plastic bondo spreader to smooth out air bubbles
2. Measure more that twice-cut once
3. Take plenty of time
4. Remember to wrap the stripe under the trunk lid and tuck it down into the trunk gutter
5. Remove any wax from the paint where the stripe will be
6. Pull the paper off of the stripe slowly and at a sharp angle in line with the stripe to avoid pulling the stripe up
7. Tiny bubbles that just wont go away can be poked with a needle to allow them to flatten out

Good luck!