First thing to remember is 'Be Careful'!
When you start to get into the higher poundages, things get harder to do, starting with getting it strung.
If you use a step through method your spine is more vulnerable when twisting.
Using a stringer also makes you vulnerable when you lean over to locate the loop.
I use a stick, similar to a tiller stick, which has a notch in one end to take the stringer and a concave end with a piece of leather glued to it that prevents slipage. The stick needs to be long enough to hold the bow beyond brace height.
I generally sit down, put both feet on the stringer with the feet an inch or so apart. Have the stick in your lap ready to go. Pull the bow towards you far enough to place the slot on one end of the stick between your feet and onto the stringer and place the concave end onto the center of the bow. Ease the bow into this position so the stick takes all the tension. Now you can lean over and locate the bow string loop in the nock. Then take the tension back from the stick to remove the stick and allow the bow to settle into the braced position.
Reverse the procedure to unstring the bow!
Keep the stick as short as possible by using a stringer that is only just long enough to fit on the bow.