I've employed someone to do my hedges in recent years but he's quite expensive, leaves it late and doesn't shape it quite the way I like.
So I got in before him this year. I have electric trimmers but they are on permanent loan somewhere. So I used hand shears and got about half the hedges done to my satisfaction. On reflection I realised this was a good move. An electric trimmer causes a spray of dust, wood and leaf. Just the thing to cause a pseudo-hay fever reaction. With hand shears there was no spray and no hay fever.
My gardener was not too pleased and did all my work over again. But the hedge is the shape I wanted it.