harness problems
They're REALLY difficult to get on. The sort that clip are best - buckling 3 buckles a time on a wriggly rabbit is impossible. They need to be fairly tight or they can catch a limb trying to get out - with the clip sort you only have to do the size adjusting once.
Our first rabbit was fine with hers - my OH was on crutches for several months and they did twice daily walks round our then very big garden (not remotely rabbit safe for free-ranging), and she looked forward to those walks big time.
Once we moved here, and she had a husbun, plus a safe walled garden for free-ranging, the harness was abandoned (he chewed it off for her several times and we gave up).
Good luck if you decide to try.