Echo the others, get some help if you possibly can. My advice is to put the horses into quick release headcollars for the duration.
This sort of highlights a much earlier thread about who looks after horses if you get injured. While you are recovering, what about looking at putting together a local horse owners network to cope with exactly this situation?
Thanks for the link to the MDIRF, I hadn't come across it before.
Jill- hope you heal well, I've always had help when I've broken arms so don't really have any tips. Are you driving? Do you have a sling? It may be worth checking the status of your insurance as my father recently crushed his thumb and was given a sling to keep the hand raised, when he next saw the nurse they said he shouldn't be driving as it would invalidate the insurance even if he took it off to drive!
My insurers said if the consultant passed me fit to drive they wouldn't have any problems but thanks for the heads up. He did say driving with a cast was illegal but someone I know had a lightweight fibreglass cast and her insurers okayed it. I was hoping to get some comfrey tablets but apparenly they were banned thanks to some slightly suspect trials on rats.