I believe it is just a "figure of speech" to say
to even think about hosting your board yourself.
however, apparently none or not much of that resume prepares you for what you are talking about trying to do.
I have known a lot if IT people that don't have a clue about anything to do with the internet etc.
as for running a website from home, it must have been a pretty simple html based site. phpbb is not a simple website. it is a set of dynamic php scripts that depend on a dynamic integration between a database and the php files and the html files and the css files etc. etc.
and all of that integration is needed for the interaction between the user and the server. that can be a lot of data moving back and forth over your home internet connection etc.