I do bodyoptimise thing because SW isn't in Australia so I have little choice, and the discipline of weighing in each week and thereby getting something for my money helps keep me on track.
However, I find this site far more useful in staying motivated than the SW website. I don't tend to ask questions here, I just tend to ramble on but I do read alot and learn alot. So, as long as you keep your focus and remember what you're hoping to achieve you should be able to do it without going to group. As soccermom said this site is in many ways better than group as we are here all week long all hours of the day/night!
Good luck!!