Hi and welcome. I am also doing SW and also have a lot to lose. I'm getting married next year and do not want to be a fat bride. I joined slimming world in Dec and have lost almost 2st (next weigh in tomorrow...hopefully make it 2st). As of last week I was 18st 1 so hoping after tomorrow I should be in the 17's. Sounds so much nicer! Good luck and hope to see you round the board.
Also if you're interested there is a group on here where we are aiming to lose 6 stone in 2012, its a really lovely group and if you have that much to lose then you might be interested in joining us.