How to make a cardboard stand up of someone!

Step 2 Isolating your image.

A good tip here is to use a background that doesn't have a lot of clutter. Otherwise you will spend a lot more time isolating the image.

Green screens work because you can later remove the green in photoshop or other image manipulating program.

So find a nice wall or use a sheet of material as a background.

Remember you will pay by the square foot. I think but I'm not 100% sure if you leave the background in you will have to pay more.
I deleted the background.

To delete the background use the magic wand tool.
http://www.mediacollege.com/adobe/photoshop/tool/magic-wand.html
Use the Control button while you click to add patches of the same color and to make it easier :) Lot's of tutorials on the magic wand tool and techniques just google that to get some ideas.

In the images below the first is the original photo. The second is the background removed. The third is the ground added back. Remember if you want to make a cardboard standup you will need a base to hold your figure up. If I were to make another I would fill in the white space between his legs. It makes it look more realistic. Fill it with a neutral color like gray. Gray will tend to blend in with other colors and make it more realistic. Brilliant white just stands out too much on the final stand up.