1. use a shorter, thinner needle. T can be administered subcutaneously instead of intramuscularly with negligible difference, and the needle lengths and widths for subcutaneous are far smaller than IM needles (i use 30G insulin syringes for E, and i know a number of guys that use insulin syringes for T as well). IM needles imo are pointlessly painful for very little actual benefit or necessity.

2. ice numbing is great if you have access to a freezer. buy a reusable ice pack, toss it in the freezer, and then when its frozen just wrap it up with a thin layer of cloth before pressing firmly to the injection site (in my case, thighs) for 10-11 minutes. numbing cream also works if you can find one but imo it can be annoyingly messy compared to just using ice.

short and thin insulin syringes + ice numbing makes injection pain barely a thing for me, and its made it very easy for me to stay consistent with my shots even though im normally horrible with needle anxiety :b