If you snack because you're bored, find something you like doing and do it - reading, knitting, crochet, drawing, making jewellery, woodwork (OK, I'm running out of suggestions but you'll find something!)
If you snack because you're peckish, have a drink (no, not alcohol!). Sometimes when we feel hungry we're actually dehydrated. When I'm trying to lose weight I tend to drink lots of tea (decaf these days!) and find this helps the hunger pangs.
Do you like celery? Apparently it has less calories than the body uses to digest it. Sometimes I snack on sliced celery with a little low fat humus.
You should aim to lose about 1 or 2 pounds per week. As said above, losing a lot of weight in a short period of time isn't a good idea. Cutting down carbs with appropriate reduction in bolus is good. Cutting out carbs isn't necessary. And of course exercise is excellent.
Good luck!