Photoshop 7.0 question? Breaking down a Picture?

I found a picture online of a tattoo on a guy. How can I take the tattoo off so I can put it on a picture of myself to see what it would look like. My girlfriend knows how but shes falling asleep. She said something like ''You have to select all of the tattoo'' Which Ive never used photoshop before. Ever I used MS paint like 5 times Lol so anyone know enough about photoshop 7.0 to help me out?

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Try using the magnetic lasso tools to select the shape and then cut it out. Then replace the space with something else.

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Press W to use the magic want tool, assuming the tattoo is all one color. Click on the tatoo only, then invert selection. Then Clear. you should be left with only the tatoo.

If one click of the magic wand didn't work, select each individual part of the tatoo then invert the selection when you have selected it in its entirety. Then clear it, then voila!
You said your gf knows but she is sleeping. Is she sleeping even now?

The answers that you have got are correct one, but it needs practice in photoshop to use lasso tool correctly.

While using lasso tool, what you can do is, make many duplicate layers of the image. Hide all others when working on each. Use lasso tool on part by part on each layer as you are quite novice. Making small selections will help you. Also, if after starting the selection, if you click somewhere you didnt want to, you can press 'backspace' key on keyboard to go back to earlier click of selection.