Over clocking Core 2 duo e8400 3.0ghz to 4.0 ghz!(Beginner)

Abdul Qadeer__

Honorable
Feb 5, 2014
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Assalam O Alaikum People!! Peace on you all! and May Allah Shower his blessing on you and keep you safe!! Ok that's too much lol can't help my sense of humour! :D
So people like the title says I want to over clock my E8400 3.0 ghz to 4.0 ghz! and I've never done it before please guide me! and is it worth it?