We have a friend that DJs as a hobby. He seems to have good enough equipment (as far as I can tell) and is very dedicated to his hobby. I've seen him DJ a house party and he did a great job.
We'd like to use him as the DJ for our wedding (especially because he should be really less expensive!) but how do we know if he'll be any good in a wedding setting? What questions do we ask to see if he's what we want?
I don't want to hurt the friendship if I find a professional is a better fit.