Just make sure you don't hit the same place more than once per week. If you were to rotate sites- day 1 left glute, 3 1/2 days later right glute, 3 1/2 days later left delt, 3 1/2 days later right delt, 3 1/2 days later left quad, 3 1/2 days later right quad. You'll end up hitting the same place every 3 weeks. This way you won't have scar tissue because 3 weeks is more than enough time for the site to heal after injection. Also, if you take care to inject properly you'll be adding further benefit by not making a mistake that will cause serious problems. Think everything out to the furthest extent possible for your own safety.