Hi Marcus,
I'm sure whatever you do will work fine. Treat him with respect, is all i can think of. It's surprising what goes through their heads, and his working for you may come down to if he likes you rather than how much you pay him.
I try to motivate a lad who helps me, i gave him a rise, but the productivity didn't alter much, so now i give him pasties (asda cornish ones) and cans of pop. He smokes rollups which iritates me, and sometimes is slow but i never moan.(i want to, but i don't)
I do backs, which usually means cons and is harder, i also have to drive, write payment cards, and plan work.
When i think about it he's on easy street, great boss, fairly light work load, and plenty to eat.It's now wonder he loves his job- I often tell him he should pay me.