Well, it sounds exciting! Even if you guys haven't done it professionally, I doubt there are many folks in the area as experienced as you.
And considering your other jobs are flexible, you could probably do both, no?
There's lots of experienced horse people around, but it's not one of those skills that often shows up on a resume. We ended up giving our regular professional resumes and a cover letter that hopefully convinces them that we'd know what we are doing. The actual job description was not made real clear but we gathered that there are other staff that clean stalls, they need people that can move horses around, get them from the stall and prep them for the exercise riders, and then take them from the exercise riders when they're done and cool them down, bathe them, rub liniment and such on them, probably, and put them away. Also fence repair was mentioned... basic other barn duties.
Yes, we'd keep our current gigs... question is whether the barn job would want ~too~ much of our time... and we applied as a team, not just one of us. We want to do it because I think it'd be good experience for how a big equine facility is managed... to file away for our own boarding stable someday.... and we want to know how we'd do at that.