I do both, using the leg is no more difficult that the ass. I prefer the leg, I use a 1 inch needle, not a 1.5 though. My advice for leg sites, sit down with your legs bend at the knees, place your hand with "The Finger" on the top of your knee cap, where your wrist begins is the measurement of how far up to go, two fingers to the side of that is the injection site. I have found if I take an area of skin and stretch it (not pinch it, but stretch it like I am trying to seperate the skin with one hand,) when I rest the pin on the area it just slips right in. It is not that difficult, just take the shot in the morning and you wont have the stiffness like you would if you did it at night and the oils just sat there.