How do I overclock a Intel Core 2 Duo E4300?

I usually build my own PCs, but I had the opportunity to acquire a Dell for a good deal. I read up on the specs, and I found dozens of articles detailing how amazing the E4300 was at overclocking. Right now it’s at 1.8 Ghz, and seeing as I’ve never overclocked before, I would really appreciate it if you could go over it in great detail.
I want to get it up to 2.0-2.3, and I’d like to know any possibly adverse effects. (Every article had it overclocked to above 3.3-and running smoothly).
Thanks!