I chickened out and took it too dealer. Did it in 10 mins for a few pounds. Cheaper than buying more tools. As my first sprockets and chain lasted 13000 miles, not something I'll be doing anytime soon.

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2010 XT660Z Blue, Exan can, UFO high front fender, SW Motech baseplate, heated grips, 12v point, Kevs Fuel & O2 mod, DNA Stage 2 Filter and cover, Givi tall screen, Mefo mfe 99s, Kevs throttle mod, TT high seat and 'compass'