The best place for injections are the glutes - period. There is a reason it is the favorite spot for most meds, as it has the least PIP, it is the easiest to pin....and for many more reasons. Therefore, aim for the glutes, and you won't go wrong. Just pin yourself in the upper-outer quadrants of the glutes, and you will be perfectly fine. Also, if you want to reduce the chances of having PIP, warm the oil a bit before injecting. For instance, you can hold the syrynge in your palm so that it will reach the temperature of your body. A bit after injecting, like 10-15 minutes later, do a soft massage on the injection site. Finally, it is a great idea to workout on the legs the next day after injecting, so that the muscles you inject in get trained - this will also reduce the soreness.