How do you sand small areas?

How do you sand small areas?
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Custom WorkstationI've never customized anything before and was adding some detail to a 6" figure using milliput. It's coming out fairly well, but I don't know how to sand down the small areas that I sculpted and the other parts of the face for painting. Also, what is the proper method for sanding down for painting? I only have a 220 and 400 grit sandpaper right now. I know you're supposed to rough up before painting, but wasn't sure what grit for that. Thanks

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Tedious but worth it in the long run.
Add me to the converted who praise primers. Didn't appreciate them much, but now I won't go without it.
Sand it down with my ultra fine sandpaper (I think it is 600 or 800 grit) to make the surface of the figure glassy smooth
Blast air with my empty airbrush to get any particles off the figure
Wash the figure with soap and water
After it has dried, use a tack cloth to pick up any particles I may have missed
Prime the figure.
Here is the thing with primer. A lot of people feel that you don't need to use it but there are so many pros to using it. One, If you handle your figures a lot, it helps both the paint to the figure to make it stronger. Two, it makes your starting point more of a blank canvas which allows you to use less paint in the long run. Three, it helps you see if there was any sculpt flaws in your work.
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