I have been cutting my own hair for over a decade - saves a fortune, and - er - cuts out the risk of being infected by the barber. The last formal cut I had - I was still working and my hair was really quite untidy - was just before a marathon, and when I sat down in the barber's chair it was obvious the barber had a streaming cold - I should have bolted but didn't - luckily I did not not come down with anything.
With Covid closures my partner went from dyed dark to natural grey - looks much nicer and her visits have roughly halved in price - but still £35 - although that includes coffee!