generally handling putty (i believe Dr.K uses the same process i'm about the describe) you want to keep your fingers wet. The water helps create a film around your hands that won't let the putty stick to it, it also gets absorbed by the putty while you're working with it making it take a bit longer to start drying.
Typically you want that extra time the water gives you to shape it out however you want, you can keep going over it with a wet finger, or a wet flat piece of styrene or w/e you want to use to essentially press it down or shape it. Once again the water will let you do that without it sticking to you or the object you use. Once you're happy with it let it sit and dry and bam minimal sanding/shaping required.
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