Ok 50 pounds in 8 months is a lot. I was able to lose 25 pounds per 3 months but I was doing a lot of home aerobics like P90x and jillian dvds. Not to mention I was a little depress so I wasn't eating as much. But if I can do it, you can do it also.
I'm in the same boat - i need to lose 50lbs (Im already down 20!!) but 50 more to go. I found a program that is working great! Email me if you would like more information and I would be happy to share! firstname.lastname@example.org