Anyone new to a subject gains their confidence (or not) if you're confident (or not)
So, I'd suggest picking 1 distro to install,.and make sure you're familiar with it.
Have multiple copies of the installer ready so you're able to get things running in parallel and then you're 75% ready.
Also be prepared for people turning up with all their cherished photos on their laptop not understanding what you're about to do, so they'll say they're happy for you to install a new OS and then be upset that pictures of Fluffy aren't there any more...