right there in your own home, google search how to do it and find some good detailed guides and get the right equipment as the guides should tell you and go for it.
though be warned as they all tell you mess it up and it could be messed up for good and don't think microsoft are going to help you after trying.
i personally thought about doing it myself but then decided not to because of the risks and will wait for a 360 that i won't mind so much destroying.
anyway whatever your choice good luck
marky j