Yeah man, plugs are a horrible job on these bikes the first time you do it. When I first did mine, I put the plug socket on the plug, then measured how long I needed the extension to be and just hit up the local store.
With the right length extension, and very small turns of the ratchet, no swivel extension was needed... maybe it'll work out to be the same story for you, maybe not.
At least you can take solace in the knowledge that it just gets easier every time. And once you have the right tools and know exactly what steps to do, it's not a bad job really. Good luck.