IF you are handy and IF it is an "obvious" repair and IF your time can't be spent more profitably elsewhere and IF you don't have equipment that requires specialized technical troubleshooting.......

then yes, you may be able to do many "repairs" yourself. Or at a minimum, you can do a lot of the maintenance yourself.

But if you don't KNOW what is wrong and if you don't have a volt meter and/or aren't comfortable around electricity and/or don't have the time, etc etc.....there are some very good techs (depending where you live) who can do in an hour what it might take you a day or a week to struggle through!

So -- it depends. I advise salon owners to understand as much about their equipment as possible, and get "comfortable" with the basics like changing out lamp holders, switching out a ballast, etc. The "cost" isn't the tech's time - it is the downtime waiting for an appointment. That is why many salon owners do it themselves.