There’s no minimum qualification or experience required. As long as you know how to navigate a computer (search, mark, copy, cut, paste, edit etc.) then learn how to apply that knowledge using FTP you should be able to install and maintain a phpBB bulletin board and you will learn along the way. The main thing in my eyes is the ability to be able to read, comprehend and follow instructions. People who use mobile devices only could well struggle.
"The more connected we get the more alone we become" - Kyle Broflovski©