IT can be a very positive experience if handled correctly. My first bit of advice is don't do it unless you can afford to lose everything...breeders, babies...even your reputation. If / when the relationship turns confrontational over a disagreement or whatever...your name will usually get dragged through the BOI.
My other piece of advice would be have a written agreement that states what each of you bring to the project and how you will split clutch production. It can't hurt to add verbage in there that covers how long after the eggs hatch that you should receive your fair share of the hatchlings.
You have to look at it as a contract unless of course you are close friends with the person in question. MY current situation of 7 years works because I trust my friend unconditionally and if all the snakes I send him or he sends me die....we both understand that each of us did our very best to care for and proliferate the snakes.
If you want to talk more in depth about this I'd be glad to give you my number via email. You can email me at B8tes_Motel@msn.com
Good luck,
Russ