I like to start along the pocket lines like ya can see in the pic. Push one needle through the hole and pull it through until there are equal amounts of thread on both sides of the leather.
Take one needle and push it through the next stitch hole from the same side of the leather then start the other needle through the same hole from the opposite side.
Grasp both needles and pull through until the stitch is taut. Repeat the procedure at the next stitch hole and so
The thread is pretty strong but if you pull to tight it will bust. If this happens stick the needle though the hole it broke on, in the same direction, and then back-stitch a couple of holes then continue on as normal.
I like to wear rubber/latex gloves while sewing. They help to grip the needle. The needle nose pliers also come in handy for pulling the needle through tight holes.