Maybe let us know a little more about it so that we could tailor advice.

There is often funding available from govt agencies and as Petals said, consumer affairs are generally pretty helpful.

The thing that you have to be careful of is covering yourself if anything goes wrong. Not saying that anything is going to but if it isn't set up properly and someone gets hurt or you do something dodgy (inadvertantly of course) it could be you that they come after to fix it.