I am a newbie, too!
I have heard great things about WW although I have not tried the program myself, too expensive!
I think you will be just fine when you go back to school.
Have you ever read the book "Who Moved The Cheese?" Its THE BEST little book. Its a motivational book that teaches fun little lessons on how to handle change effectively. You'll just need to realize how important your weight loss is to you and find tools to help you along the way!
You can soooo do it!
Enjoy your summer! You deserve it! No worries!