We recommend starting with the belt around your belly button. It's a good starting point and over time you might find you prefer to wear it a bit lower or a bit higher. You may even prefer a different placement on one lift or another, personally I wear my belt higher on sumo deadlifts and lower on squats. The answer as to how tight you might want to wear it is harder, it should be tight, but not so tight as to make it hard to breath into your stomach and brace against it.