I am getting my vitB injections soon, but have never given myself a shot OR had anyone show me how.

Is this something easy to figure out?
I am probably going to get on the Vitb methyl tabs but am going to try the shots since my doctor seems very trusting in me. So I want to show that I'm listening to him... at least somewhat. And keep him listening to me.

I am scared I won't be able to do this.