Hmmm...unless circumstances are extreme and its a pro...I would advise to stick with glute injections, and quads as a secondary. Spot injections can be quite tricky if one isn't extremely careful
in my opinion , you don't need chest shots , unless you are taking suspension or something ..frequent injections and you need to rotate as many sites as possible
when i was on test prop i shot in chest.. it really doesnt hurt as bad as delts or glutes i think, but everyone is different. i went about 1 inch up and towards the center from the nip. the most painful is triceps dont ever do those lmao