Or you can buy a jig like Spyderco Sharpmaker and have a razor-sharp edge in 5 minutes.
Right now I switched to proper water stones :)
I don't care if you are a fifteenth generation swordmaker who practiced for sixty years...you cannot hold a blade in your hands steadily, at sub-mm precision, for more than one stroke
changing the angle even slightly is effectively starting over
but if you must go old school - BELGIAN COTICULE...all other sharpening stones are inferior, it is no contest imho
That's what the guiding rails are for... So far whetstones with guiding rails are the best sharpening method I found. As you can see from my other comment in this sub-thread, I find Spyderco lacking.