Cutting snacking is a great way to start, or choosing healthier snacks.
When I first started losing weight, I set out making very small changes - I focused on reducing my portion sizes, cutting out the hand to mouth snacking motion and drinking a bit more water.
Later, I cut out all Fast Food places, then I started getting some exercises in.
It's about small steps at first - but remember, nutrition/your diet is the primary aspect of losing weight.