I'm about the same dap as you 5'8" and was pushing 12 stone which is big for me.
Been doing slimming world with the wife for the last 5 weeks and lost 9lb. Eating plenty just not crap and finally doing a bit of exercise.
Want to get to 10st 10lb the weight I was when I was 25.
It's quite easy when you get in the swing of it although I'll struggle when back in work and Greggs in the services tempts me in all the time.