I just wanted to thank everyone for their advice, input, and overall suggestions. We ended up finding a licensed contractor who is very professional and we feel, is doing it the right way. He's dug down 4 inches, laid stone, placed wire, set the forms and made sure the pour is going to be level. The concrete will be 6 inches poured tomorrow morning, then I guess its "wait and cure". Hopefully we'll see our spa on it within the next 2 weeks. Thanks again!