Not very, judging by the number of people in the barbers shops I walked past yesterday.
I could really do with a haircut, as it's now due (my hair goes fine, fine, fine, TOO LONG) - I'm tempted to get it done now before things get worse, but don't think that's wise.
The barbers I use is slightly out of town and never ever has a queue - I really don't know how it keeps going, tbh - but even so, it's close contact with the barber, plus all the dust of everyone else's clippings, so falls into the "unnecessary risk" category for me.