I use a similar socket except for 13/16" plugs (and hex). The best way to turn it for most plugs except #6 was to use a swivel-head 13/16" ratchet on the hex.
You'll develop your own technique for plug changing soon enough, OP ;) Every combo of block, cylinder heads, headers, starter, etc. is different. Just accept that it will be a moderate PITA unless you have fenderwell headers. Then plug changes are easy but they interfere with the steering, tires, ground, and parts you haven't even thought of yet.