The video below shows an example of sub q injections. It's painless. You waste less T in a slin pin than you do in larger gauge needles. I always got steamed after an injection when I would pull plunger back and see all the wasted testosterone that was still in needle and syringe.
The doc mentions he gets a little bruise every eight to ten injections. I've never gotten that.
I did feel a nodule for two or three days after one injection but nothing to complain about and it was certainly not sore to distraction.
Pay no attention to his comment on a "fine little jet of oil that traumatizes the injection site and used oil filter into a plastic bag" line. I have never heard that before and not experienced it.
If you do the subcutaneous injections you can rotate around your navel. Rotating injections is a subject you need to familiarize yourself with or you will develop corky hard areas from scar tissue (even with the insulin syringes.) The sub q injections as stated before will give slower absorption and less of a T spike and should be less aromatase.
I had a friend with type I diabetes since third grade and he developed scar tissue from that many years of injecting just on either side of navel into belly fat. Rotation even with some intramuscular injections added monthly would prevent scar tissue buildup.
I personally use a small 28G & 27G insulin syringe with a half inch needle. I do pinch the fat around my navel when I inject the needle, then I release before I push the plunger in.
Remember rotation of sites are important even with sub q injection.
Maybe the youtube link will work here: