Haha, I have a Blazer as well. A 98 GMC Jimmy to be exact, but same platform.
With the Bentley Manual and a decent socket and wrench set you could do all the work on your own car. The belt tensionor is an 18mm socket. The skid plate is a 10mm socket. The oil filter is a 36mm socket and the oil plug (on mine) is a 15 mm wrench/socket.