Untangle any the straps before buckling the clasp. Twisted straps create a narrow edge that can cut through your skin more easily than a flat strap.
Fasten your seat belt immediately after sitting in your seat on the airplane. The only time you should remove your safety belt is when you getting up from your seat to use the restroom. Even if the seat belt light is off, the safest way to fly is by wearing your seat belt whenever you're in your seat.
Pull the adjustable straps until the belt is firmly on your hips. Having your seat belt high and across your stomach can cause organ perforation should the plane suddenly jolt.