MattFlo,
I am a Pharmacist and the only experience I have with Testosterone gel is for elder cis-men.
Yes it is messy and if someone female lays against you at the gel site, they will also get a dose of Testosterone, but much smaller than you. If you apply gel with bare hands, the same goes for anyone you touch without washing your hands.
On the other hand, many older men do use Testosterone gel without significant problems. If injections are not for you, then gel is a safe effective way of getting Testosterone. Expect all the normal side effects, such as body hair growth, acne, aggressive behavior and on and on.
One final thought, maybe your technique for self injections needs a little more training or use medium needle for drawing up the injection and then switch to a smaller needle for injections into your muscle.
What ever you chose to do, I wish you the best.