! Have a look around the forums - there are lots of diet support forums and exercise motivation here to help you formulate the plan that is right for you. I know how 20 lbs can seem like a mountain, but honey, we can do this!
. . . You've definitely come to the right place and you just might want to have a look at the special Featherweights Forum . . . http://www.3fatchicks.com/forum/forumdisplay.php?f=197

You'll love it! Best of luck to you!