How to take photos on my DSLR where I'm in them twice?

I wanna know how people take pictures where like a figure of them is looking one way, and it is faded, then another snapshot figure of them is facing another direction doing something us, less faded than the first one and so on. What do you even call this? And how do you do it on a DSLR? Or Nikon D3000?

With your D3000 mounted on a tripod, take the two shots you want.

Using a photo retouching program like Photoshop, combine them using some of the tutorials you can find on the Internet that discuss superimposition

I'm asking the same question too but what I have thought previously was you must use a long exposure for that. Set it on a tripod and then set the time for example, 4 seconds and then press the shutter. Then sit for 2 seconds and then stand and walk around or change position for another 2 seconds. Is that the way it should be? I don;t know myself but I'm going to try that out soon.

Two ways to do this, need camera on tripod for both;

Take one long exposure (need dark conditions), stand in one place, open shutter, fire off camera flash at yourself, move, then fire flash again at yourself in second position, then close shutter. This is more likely to produce the 'faded' look you're after.

Take two exposures with yourself in two separate places (this does not need the dark conditions that the above method does) then blend the layers together to make a single image. Google 'Cloning in Photoshop' for plenty of online tutorials.

Well, the key is in your question.

You can't take a photo on your DSLR where you are in the picture twice. What you need to do is take multiple photos, each with you in a different location/pose. Make sure your camera is on a tripod, and use some type of remote release (wireless, cable, bulb, etc). This will ensure that your backgrounds match perfectly.

Then, use software to composite the images into a single image.

I was bored one day not too long ago and did just that.
http://www.evildaystar.ca/wedding/?p=238

You basically take two shots and merge then in Photoshop or theGimp

EDIT:
You could also do a very long exposure shot. Set your exposure as long as you can (30 seconds I believe) while keeping in mind exposure. Using a remote trigger is recommended. Setyourself for your first pose, then hit the shutter, halfway through the shot (around 10-15 seconds), move to the second position.

If you want some motion blur, you'll have to make the transition slowly from pose 1 to pose 2.