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it depends....whats the problem with it? is it not working or did it fall off? I havent tried but if it fell off you might be able to put a dab of glue on it and put it back. if you have to replace it then yes its a big job. this is not something that I would suggest you attempt as a dyi repairl
 
I tried to stick a spare button but was tough. Almost messed up the button functionality. Right now I can still use it with inserting my nails!!! So much for an expensive phone, ha! I have another button but am wondering if I should try to stick it again.
 
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