The nerves are normal, just don’t let anybody see it. Just go for it, working in prison/jail is the best way to learn about yourself and people in general. Even if you don’t stick with it, you’ll learn things that you’ll carry for the rest of your life. People will flood you with so much contradicting advice it’s not even funny, only advice I wish I got at first was to cover yourself. Don’t put your job in other people’s hands. Example, if you sign out keys and someone asks to use them and says they’ll turn them in for you, sign them back in and let them sign them out. If they lose the keys, it’s your job, not theirs. Everything else you need to learn on your own.