For the MP I cut one Lidoderm in half and place 1/2 in the groin (just at the top of the thigh above the bend),
near the midline of the body, and the other half at the other end of the groin/top of the thigh, almost to the lateral aspect of the thigh. As high up as you can go, before the bend.

This placement really helped me. At the time years ago I had very painful stabbing...like a hundred bee stings often. Then in between stabs I had numbness mostly in the upper middle thigh.
My numbness is almost gone now, and I only get little stabs if I over extend the leg, or sit in a hot tub or steam room. The steam room (which I love for other reasons) sets that nerve off for me within 10 minutes!

Avoid tight clothing with MP...tight jeans are the worst. Girdles are not good either, anything tight across the abdomen, or at the thigh/body junction. I only wear unfashionable polyester, and loose underwear. (combined with my comfy shoes, I am a fashion disaster!!LOL)

This diagram is very good too....from a copyright protected place so I cannot move it here.

http://www.aafp.org/afp/20000401/2109.html
Figure 2b