Since I will pin ED soon Id like to get feedback on which spot is the best and how do you inject it ?

Any tips and suggestions are welcome, the friend that injects me in triceps and shoulders would not be available as he is working on a diff gym so I would need to pin myself, The places that I want to inject are shoulders (those I think are easy for self injections), quads and triceps (ive done triceps 2 times and i really dont like it but fk it)

how do you perform self injections and which other sites do you recommend? Also for quads, can I pin 2 times per week?

Thanks in advance.