I just don't eat to full capacity and I seem to lose weight xD. I don't really do much besides lifting things every now and then (household things, like transporting guitars and moving speakers around).
Also have hypothyroid so losing weight is actually supposed to be hard for me xD. As long as you get up and move around every now and then, don't eat till you can't move, and don't eat too many things flat out horrible for you (Impossible to be happy without eating snacks I like sometimes xD)you really shouldn't gain a lot of weight. Some people got to try harder than others, but you shouldn't be making a huge deal out of it unless it is a big issue with you (under 5'6 and broke 200 pounds kind of thing).
you can also just do like 20 pushups and 10 situps twice a day each and be totally fine =3. Unless your an athlete, you shouldn't need to do too much more =3.
The only reason why I know this is because I was an active athlete in the past. Played street hockey, basketball, teaball, track, and football. Lately though in recent years I'm just not able to do what I was able to do in the past (got really sick and went to hospital and such). Don't aim at losing more than like 40 pounds at a time, as if your too big it could actually kill you.