Although accuracy is not the same as precision, a good amount of both in woodworking pays dividends in assembly and the appearance of the final product. Practice in the craft is the first way to get better at both, but decent tools don't hurt! My first line of defense against a sloppy project is an appropriate marking tool. I say appropriate because the marking tool I choose to use depends on several factors. I have a plethora of mark makers in the shop, some are good for rough scrawls and some leave hairs-width straight lines.