congrats!
the best part of life is about to start, the part where you get to be you and others can see it!
I would watch some youtube videos on doing an IM shot. I did before I started and I am glad I did. Gave me the confidance to do it right. (injecting T and E is the same thing, stab the butt or thigh and inject)

Oh and full disclosure....when I was on injectable E I would just have my spouse do it for me and when it wass time to give hir an injection I do it for hir.
we have both gone to other delivery methoods for HRT
ze uses Testim gel and I go with oral E.