I've had two small blazers, one with a 4 cyl and another with a 2.8 V6. The 4 cyl was no problem to work on. With the 2.8 V6, you had to remove part of the fender above the front wheel and reach through the wheelwell to get to the oil filter. Also, you had to turn the wheel all of the way to the right. As if that wasn't enough hassle, you also had to jack-up the body to get the wheel and suspension to drop enough so that you could reach your arm into the well. Then, you had to wrestle blindly to get the filter off. The spark plugs were an 8 hour hassle. From what I remember (only did it once), I did have to remove about a dozen minor parts to get to the wires (nothing like the intake manifold). As much of a pain as the 2.8 was, the 4 cylinder wasn't bad at all. It almost made up completely for the poor gas mileage and poor acceleration of the 4 cylinder.
brouhaha, make sure you replace the wires one at a time. That's a good idea to keep from mixing them up (talk about a rough idle!), and if there's one wire you simply can't replace, then you might can live with that, if you have to.
Despite the GM S-10/Blazer's poor design, the new Corvette has to take the prize. You have to jack-up the back higher than the front to completely drain-out the oil pan. Think about that. You drive the front up onto ramps, and then somehow, you have to get the back higher. He has ended-up going to Jiffy Lube, and having them drive over their grease pit then back-up onto a set of ramps under the rear wheels. GM could have easily put the plug on the rear of the pan, and then when the front was on ramps, the oil would drain. Wouldn't that have been a good idea?