Join Date: Apr 2015
Location: Mechanicsburg, PA
They're not terribly difficult to change, but not brain-dead easy either.
You want to pull the chrome covers off, and pulling the tank does help. Even more than that, having the proper plug socket and a 'wobbler' for your socket drive is a huge help. Especially on the front plug, you really can't go in 'straight' effectively. You need the bit of offset a wobbler provides.
Getting a torque wrench to ensure you tighten them correctly is an excellent suggestion. Under-torque them and they'll loosen up. Over-torque them and you'll end up cracking them on removal and be facing a drill & retap on your heads - not fun.
It's really not a terrible job. I typically do it 2x a year. Once just to examine them, once to change them. I change them annually "whether they need it or not". Cheap insurance. The proper tools make the difference between an easy 20 minute job, and pulling your hair out.
FWIW, I've found that 'split fire' plugs improve my performance and tend to come out cleaner/better shape (suggesting better engine performance) than 'traditional' single electrode plugs.
2007 V-Star 1300