Really, you will be fine if you follow the recommendations.
I would also use a Capsule as you stand up and tan your whole body simultaneously.
You start off with the suggested 3-5 minutes, have a day off, then 4-5 minutes, day off, etc. etc. until you are tanning at 10 minutes a piece. Once you get to 10 minutes you should have relatively tanned skin. You then go back once a week to keep tan good (in case you get absolutely no light at all).
But after 2 months, stop going. You shouldn't expose yourself for a long period of time, as you are putting your skin at huge risk, as people have no doubt mentioned.
J
EDIT: sorry to revive a slightly old thread.