[mikim]

HIRE IT OUT! that's too big a pour for you to do .. especially since you've never done it before. You need the rebar to hold the concrete together -and I'd highly suggest 10 mil plastic vapor barrier under it as well. It has to be formed up, leveled and squared, plastic down, rebar & wire, skreed off then finished..... too much for one man fer sure - it takes a crew ... preferably a crew that 1. has the tools needed and 2. knows what they're doing. Even doing a small 10 x 10 pad is a BIG job for someone that has never done flat work before. The amount of $$ you'll spend on labor is half of what it's worth. A quick and dirty estimate for concrete is 81 sq ft 4" thick = 1 yd. Lately around here concrete work has been going for about $10 sq ft complete.