And this Sir is what insurance is for. If you are serious about wanting to do something like this sit down write a business plan, get bonded, buy a general liability and a business owners policy to cover your self. To be honest with you I don't think that your insurance or bond would cost you all that much. You may have to call around because not every company will accept that risk.
To add to this "if you are serious" and you would like some help with developing a business plan...etc I would be glad to help. You may also want to think of a business name and set everything up get a small business loan...even if you dont need it rates are great. At the least get a line of credit...in business you never know when you may need to get your hands on some money. Something else you may want to order a few replacement parts (maybe from DCFISH he has everything) that way if something gets screwed up you can fix it...fast. That would keep people happy if you messed up something. I would absolutley have an attorney draft a disclaimer for you the way you want it and everything else. You would do well...