I am not sure if it is good or not but I always put an ice pack on my butt where I am going to do the injection. Once the location is numb then I place the needle on the location, put a little pressure and it glides in just like a hot knife on butter. I do this because when it comes to needles and pain I am a real pansy. I have not had any problems with this and I still see the results that I am looking for. I have not done my delts or my thighs before. I am wondering if the location makes a difference on the effects that you see over the time of your cycle.