Try this quick and clean method for separating yolks and whites. Gently crack an egg over a slotted spoon set atop a bowl. The white will flow through the openings, leaving the yolk intact and your hands mess-free.
Whipping up vinaigrette can make you wish you had three hands -- one to whisk, one to pour the oil, and one to hold the bowl steady. A damp kitchen towel can do the trick. Just twist the towel securely around the base of the bowl to keep it in place.