I don't know how to get the middle plug on the driver side out.
I got the spark plug shocket in,but can't get any kind of wrench on it
any ideas. it's a 95 blazer w/4.3l vortec motor

 

I used a 15* swivel extension to get mine. It only got tight at the last few threads, but by then I could turn the socket with my hands. You can also pull off the steering shaft cover to gain more room. I don't know if your '95 has a cover over the steering shaft though. Also, the shaft should be 'D' shaped. Line up the flat to the bottom by turning the steering wheel and you'll have a bit more room as well.

 

I pulled the steering shaft rubber boot down for more clearance. I inserted the plug socket and used a Craftsman gear wrench (the one w/ the flex head) to break it loose. Removed the tools and inserted a small hose on the plug tip and used my fingertips to spin it out.

I just reversed the order to install it. Don't forget to gap and apply some high temp never seize on the threads. (not applying the stuff on the threads near the electrode.) Then pull that shaft boot up where it was.

 

If you go from under the shaft thats in the way you should be able to put the socket on and then put the ratchet onto the socket. oh and that shaft is an oblong shape so turn your wheels a little for the right angle.