If you want, you could take out the lights, wrap them in cling tint with a little excess so that when you reinstall them, they'll really be stuck on there! My work fine just by leaving the lights in though...
OH, and I have come to the conclusion-after working on them all morning-that cling tint does not like our headlights...I tried to make some eyebrows, but I don't think it's going to happen. [rollseyes]
There was a guy on here from FJ, talking about using a bit of pinstripe to give extra hold to some of the tint, I might try that...