With 200 amp service you shouldn't have a problem finding an opening for it, but remember to use a GFIC ( ground fault interupter )breaker. This is extremely important when you are dealing with any outdoor appliance especially pools and hottubs. The installation isn't complicated, but somewhat different to your regular breakers. You will find a white wire coming out the back of the breaker. This must be connected to your neutral block for it to work. I would use what we call "Tek" cable up here but anything electrical should be confirmed by the building dept for code. Usually any electrician in your area will tell you what code is.