Is it easy to attach the power on button on Iphone 4s?

My careless brother dropped my Iphone outside i dunno how the screen didn't crack but the power button got stuck, so i tried to get it loose again but it fell out altogether and there's a hole there but the button still works when you press it down, I ordered a new one off ebay but i have no clue how to attack it, do i need to take the phone apart or something? Is there any instructions online?

Try in youtube, you will find the video instructions on how to do it

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