My iphone 4 power button is stuck and i don't know what to do diy wise?

Basically the power button on my iPhone 4 is stuck i can't see any thing in there like crumbs or dirt and I want to DIY fix it cos the shops just charge stupid amounts but I don't want to screw up the phone any ideas?

Added (1). Also when I try to push the button up it just comes back down again

Ok, do this.

See the two tiny screws at the bottom of your iPhone? Unscrew them, then gently take the screen off. A suction cup can be handy for this. Then, when taken off, gently push the power button up, then it should work fine. Put everything back on, and you're sorted.c

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