Alex,
Congratulations on arriving at that place where you were able to make a committment to yourself to stop once and for all. If you plan on taking this action by yourself without other support systems you might want to check out some simple techniques for remaining permanently substance abuse free at the Rational Recovery website. Many people take the AA path but there are other alternatives. It is your sobriety and yours alone and you owe it to yourself to check out what is out there for your own sake.
Best of luck,
Dart