Vacuum Trimmer

I'm just wondering because I used to shave once every two days, so I was wondering how they do up there.

Direct from NASA:

Question: On the basis of images of Don Pettit, it seems that you shave in space. If yes, how do you contain the materials?

Pettit: We use either a safety razor, which contains the favorites in the shaving cream, or an electric razor that captures the favorites in the head. I empty my razor once a week.

I've seen shaving and it seems they use a standard electric razor as you would use the earth and nothing special. The whiskers go into the unit. I am sure we take care when it has emptied.
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Just like you probably. They have to constantly excersize their muscles will not shrink.

Yes you nailed, they do the same for haircuts regularly.

leaving the film set and use the bathroom.