Did mine last weekend. Couldn't get Champions, so settled with the NGK CR9E's. JohnnyO reckoned I could have put a hotter one in.
The problem with NGK's is that they don't come with caps, just the bare screw thread. You need the caps, because the connection to the plug is by a coil spring, and it won't do this properly to the thread. So go out and find some old caps, if you can't get Champions.
Next problem. The plug spanner that comes in the kit is fine for #1 & #2, but you won't get it past the frame for #3. I cut mine to length and drilled some more torque bar holes in it, and it now works a treat. You don't need the 17mm socket on the other end.
Also a good time to check if your tip-over switch works. You'll have the air box off, so have a look.
The Champions have moulded caps.
NGK probably make Iridiums, but I didn't use them.
You can take the tank & airbox off without removing the upper fairing panels, but with them off, you don't have to worry about scratching or chipping paint. You also have more room to get at the breather pipes and fuel line. With them in place, you probably could do with a second pair of hands.
Remember to put some cloth over the top triple clamp to protect it from being scratched by the front tank bracket!
It is about 3 litres, that's how much I had to replace when my front core plug let go and the coolant p***ed out all over the floor. The system was completely emptied by the time I had limped home with my eyes glued to the temperature gauge.... :eek
I was talking to John O last Friday. Amongst other things, he reckoned that he's added up to 600ml of coolant after bleeding the system - lean the bike as far as it will go left, stand up, top up, lean all the way right, stand and top up.
Try bleeding it.