New to peptides - injection sites

My girlfriend is new to peptides and I know nothing about them myself. She is wondering how to go about the injections into localized areas. She plans on injecting into the muscle group she trains that day obviously. Delts, quads,and glutes are straight forward, but wondering about hamstrings, and muscle groups on her back. As she is required to inject after her 10min warmup I will be unable to assist her with these and hoping to find the easiest methods of getting the substance into these groups.

I wouldnt mess with hamstrings but I rotate between delts, tri's, bi's, lats, and pecs

I've done hams... small doses and the pumps are crippling, but shortly after doing that my always lagging hamstrings responded like they never had before. I always find I have to train lighter when I apply IGF as the pumps make me noticeably weaker, but damn do I get tremendous results.
I applied right to the middle in the meat of the ham and massaged for several minutes. You have to keep them super stretched as they will tighten up quickly

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