I've found the greatest aid to my sharpening is to sharpen as I work, never let the tools pile up. If I need to sharpen more than one or two cutters by the time I get to the last one I do a crappy job. Even with a new or new to me set of chisels I can take weeks to sharpen all of them because I will normally only work one at a time and then may take a day or two between, and I enjoy the sharpening process but never a pile at one time.
ken