It's all down to will power,
Don't :- Drink booze, eat chocolate or any sweets, give up tea and coffee, give up takeaways, stop getting depressed about your weight.
Do :- Start walking everywhere, eat loads of fruit and veg, drink lots of water when you feel hungry, grill or poach all meat, eat porridge milk/water in the morning, sort out portion sizes by weighing what you eat, start swimming or running or walking or lifting weights, Squatting is using your biggest muscle in you body so do it up and down without any weights use your own body weight just bend your knees and straighten simples........
Easy right ?
Well that's what I'm doing and I've lost nearly a stone, my blood pressure was over 150 a month ago just done it this morning 121/88 so getting there and my weight from 15st 11lb to 15st 1lb, I was considered Obese but i'm doing it because my dad dies at 57 and I'm 47 so I was on the same road as him.