Nicely produced video!
The idea that a 1/2 #29 needle will produce a jet that can damage tissue is bogus. With that needle, the flow is limited by viscosity. With moderate pressure you inject “5” iu [.05 ml] per second and can easily go faster with no issue. I did find that when pressing very very hard, the jet can sting, but that is very extreme and unnecessary. Again, do what is comfortable.
Injecting laterally into the pinch does not cause damage or leakage. When you let go, there is no pressure. In any case, leakage from a #29 puncture is going to be less than the needles that he suggests.
With longer injection times, there is increased risk for the needle tip moving and cutting the tissues. When you inject laterally into the pinched fold of skin, the needle barrel end is steadied by the pinch. You may also find that you find other ways to steady the syringe to eliminate movement during the injection. I rarely get bruises or bleeds. I do press on the puncture immediately to allow closure, 10 seconds works for me.
I also like injecting over my upper legs as this allows one to sit, be still and see things well. With longer injection times, siting and being still has merit.
Costs: Insulin syringes are very inexpensive and are available without Rx in most jurisdictions. The needles that Crisler suggests probably cost more and as he suggests, some may not be readily available.
If you are self injecting and you doctor is opposed to injecting more than once a week, most guys can get insulin syringes without Rx and manage how their weekly dose is delivered. The syringes that Crisler suggests will be Rx only and then one is a slave to their doctors whims.
Swab and reuse: I understand your concern. But when you consider that you inject through the skin, which is teaming with bacteria, what is the concern then. Swabbing cleans the skin, removes loose dander, dirt, oils, sweat etc. If you are worried about bacteria, look at the procedure for taking blood donations or surgeries. I press a plastic tube, a pen cap might work, onto the injection site. That marks the target. I then swab that and then I can see where I swabbed and inject there. I swab aggressively, scrubbing the skin, second pass with a clean corner of the swab. You might see the color of you skin pigment doing this. The way Crisler swabs with a casual wipe is a joke.
The EOD injections produce serum levels that are steadier than Crisler suggests. There are numerous injection deposits with overlapping release curves. As for not needed to use an AI, when I switched from EOD IM, same dose same syringes, to EOD SC, my E2 labs did not change and I did not need to change my anastrozole dose. So IM VS SC did not matter for me VS IM once a week. I did not do IM very long. I started T, then T+hCG and with the hCG and insulin needles, I started T that way ASAP to be able to harmonized T and hCG injection routines. I introduced AI later. So I did not get to compare T+AI IM once a week to T+AI EOD.
Many stated and doctors state that T in oil cannot be injected. As an engineer I knew that that was wrong, time is the only issue. From a doctors point of view, they expect to load and inject in seconds, so they would think that way.
My age management Doctor reports that he has guys that after a couple of years, do not need an AI anymore. I have trouble accepting that fact. However, if a guys loosing major amounts of fat, then the aromatase problem may be reduced to get acceptable E2 levels without an AI. But is the acceptable level optimal? Even that is all true, that does not mean much. One still needs E2 management and if the labs results indicate that you need less and less anastrozole, that works.
This seems like a lot of detail, but it all boils down to a technique and a simple routine.