If you are hearing from God, that's all that is necessary to guide you to what to put down and what to pick up!
I have been struggling with forgiveness lately too. And been seeing that if we don't get past and through it with His help and as He demands us to, we really shouldn't expect to go farther with Him. He just waits at the spot where we refused - waits there for us to come back.
You will do fine with the prison ministry if you listen for His direction.
Good to talk to you again.
Please come back and let me know how it went when you get a chance.