All this advice is good here are areas to pin in order of least pain…test cyp/eth should be good almost anywhere so maybe yur gear is janky…once I got some Mexican test pure trash burned like a shot of herpes & tequila…
Draw with 18s pin with 23s 1" if chunky 1.5"
In side of quads & delts 29s slin = no pain
In order of least pain…glutes, rear delts, side quads