How do you take a self portrait photograph?

I want to take a picture of myself, but of my back, and not myself actually facing the camera.

When I've tried to focus the camera, it won't focus obviously because there is just a blank background, and hasn't got an object to focus on.
Is there any way to get around that?

I have a Nikon D40 by the way.
* And also, I set it on timer, before I focus.
You're gay.!! haha!
 
If I gave you an honest answer you would be sure to dob me in to the YA Police, so I pass.
 
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