Also check out Pazzo
levers. Cheaper than the Wunderlichs, but then again they do not adjust for length, just for reach.
They make long and short versions. I personally always use two fingers on both levers and have the Pazzo shorties, and they are a huge improvement over the stock levers.
You should be able to pick up a set or single lever directly from them or from a dealer (which I did for less than MSRP), plus you get to customise your colours.
As for replacement of the clutch lever, it's really simple. The only tool you'll really need is a screwdriver to remove a single bolt on the clutch housing, and the rest is easy peasy.