10 lbs by Christmas is totally do-able. You are definitely in the right place. Hop on over to the fitness section and check out the various exercise threads. If you are a runner/walker/biker the Team FitDay thread is very active and a bunch of us use the "did you exercise" thread to keep motivated. (I know there are a lot of lurkers who benefit w/o posting, so that's OK too, but it would be great to hear you stories.)
And the women's section, especially the weekly motivation thread is super active. Sometimes too active
it's hard to keep up, but lots of great people and tons of support.