Piece of cake, really. Remove air box, remove bolts holding the coil retainers on either side of valve cover, (Euro3 bikes are a little different from earlier ones with the second air system in the valve cover) pull the coils up and off.
Now the fun part....find a deep plug wrench thin enough to get down in there (tool kit came with one), R&R plugs, reassemble.
Suggest you get a piece of rubber hose you can stick over the top of the plug to get it started on installation. Long magnet will lift it out of the hole once loose.
Buy Iridium plugs.....do not waste your time or money on anything else. All the Jap brand dealers can supply the correct Iridium plug for a fair price. Shop around.