For straight or semi-recurve bows, use the push-pull method:
(Right Handed)Place lower tip off ground against inside of right foot. Simultaneously, pull bow handle back with right hand and push limb forward with left hand, sliding string loop into upper nock. "Turn your head to the right away from upper tip".
The above method has been taught for as long as we are old:) It works great on normal weight bows under good conditions. On bows over 65pounds when your boots are covered in mud, it is cold, and you are tired....it can be very dicey. Get yourself a pocketsize bowstringer called the "Bow Pal Stringer" made by Golden Archery in Cheyenne WY. These little things are one of the best longbow stringers ever made and are ideal for hunting. They fit a Hill type longbow perfectly.