I've had 3, only one of them was any good, and I should have got rid of the others much sooner than I did.
At the moment I'm working 3 days and I've got subcontractors covering rest of the work. All the subcontractors are JW's, and they are mostly very good.
The first guy I hired was okay, and was with me for over a year, but we had a lot of underpriced work back then, and with two of us working from one van it was a struggle. I went back to being a one man band, got rid of a lot of unprofitable work, and made some big changes to the pricing structure.
The second guy I hired had been in a bad road accident several years before and he worked in a van by himself. He was good with the customers, but he found it hard to do more than £260 a day, which isn't enough . He was also really accident prone, and he was off for quite a few weeks in the winter and he claimed he couldn't do gutter vacuuming due to the accident.
The third guy I hired was brilliant. He was a former mechanic and he used to bang out £300 days, and be back by 1pm, but he was part time and I let him go when we started using sub contractors
To make it work you need to accept that most of them aren't going to be any good, and be financially prepared for the costs of going through several employees until you find a good one.