Make sure you recognize the major difference between rebuy tournaments and standard tournaments. In rebuys, play a little looser in the early stages of the tournament. Pay attention to the amount of bets you have and push those pots whenever possible. And don't be afraid to go broke on drawing hands. And remember that many players use a similar strategy (although they very often don't seem to change up later). Make sure you get in there and build a decent stack and hopefully if all goes well, you will win the damn thing!