I've got two of'em. I just pull that bolt out of the top of the gear box (that locks the shaft into the box) and pull the shaft sideways to get clearance to get that #3 plug. None of the others are impossible to get to, just a PITA on #7 and #6.
The wires on the passenger side are in order with the plugs. The ones on the driver's side aren't so either make a note or replace them one at a time as you replace the plugs. It does make it easier to get the boot back on #3 with that steering shaft out of the way.
From experience, everything is a pain in the butt to work on on those things. Can't change the transmission pan filter without taking the transmission cross member out and the y-pipe loose, can't change out the electronic transfer case shifter without taking the front driveshaft loose and moving some other stuff out of the way, can't grease all the ball joints without taking the front tires off, getting the old starter out is tough, putting a new one in take 3 arms (one real long one) or two people, replacing the exhaust manifold gasket on the driver's side means taking the serpentine belt bracket and the AC compressor and power steering pump loose, etc, etc.
I'll keep the two I've got till they croak, but I'll never buy another one. The Cherokee Sport is much easier to work on but the ride quality sucks compared to the little Blazers.