Hello and welcome. I've done 6 months (not strictly strict for some of it!) and have almost got the 5 stone off. Most I've ever managed on any other plan is a little over 2 stone and that took me 2 years! It's so doable, you'll be at target before you know it
I'm starting s&s today, as so far am loving it. I did a VLCD several years back, and was 100% for 19 weeks and lost just over 5 stones. Stick with it, it is so worth the results.