I have worked at a horse boarding facility taking care of 30+ horses last summer, so I'm familiar with the work. I fed in the morning, turned in/out, did all the stalls, threw hay, turned in/out again, and fed dinner. I had to eventually stop working there though because I was working the whole weekend by myself, which was nearly impossible, and very very hard. I had been promised a partner or assistant but that never happened. So the only thing I'd be wary of is working a big barn all day all by myself. With one other person I can easily do it, but alone I really can't.
Please contact me here or in a PM if you have any suggestions. If you have a website or pictures, or even just a name and a number, please let me know.
As a side note. My horse is a 16hh WB xTB. He's very well mannered and gets along with most horses. He can't be turned out with mares, but other than that he's fine. Can be a bit bossy but doesn't get aggressive as long as he has his space. He loves people and is very friendly, no bite or nip, and no kick in him.