How do you guys manage to do vastus lateralis injections? I fail maybe 2/3 of the time. Either I hit a vein or I hit a nerve... After a lot of failing, I finally found a spot on the right thigh and marked it. However, I just cannot do it on my left thigh. After hitting veins several times, the whole area goes numb and disables me from trying any further. Today I actually thought I was successful, but at 1" in, I hit something (nerve probably) and had to pull out.

What do you do to succeed? I mean, the injections at the ventrogluteal and dorsogluteal sites are so easy, but the vastus lateralis... The reason I want to do this injection is because I need more sites for rotation.
Thanks!