I don't want this advice to get muddled up into other threads where people already have a financial interest but if I can give one single piece of advice learned by myself the hard way more than once it's this: Don't ever enter into any kind of "working agreement" with another beekeeper that involves giving them custody of your hives and the right to open them and work them in any manner and for any reason. I don't care how attractive the arrangement or how trustworthy the caretaker may seem to be, my experience is that these arrangements have a very, very high probability of ending badly and the probability increases with the distance the hives are separated from their rightful owners. I don't mean this as an indictment of anyone who is on or who has ever been on this forum. It's simply a word of warning for anyone who thinks an Internet forum is a good place to do anything other than to exchange information. This is not a good place to set up business agreements unless that person has lots and lots of good references that you can independently verify.
"Ve are too soon olt und too late schmart."- A nameless German philosopher