DIY.. what you asking is pretty simple and stuff you should know anyway.
You need a chainwhip, cassette tool, chain breaker tool and some allen keys, grease. Sorted.
http://www.parktool.com/repair/readhowto.asp?id=48 http://www.parktool.com/repair/readhowto.asp?id=25 http://www.parktool.com/repair/byregion.asp?catid=14
@hippy started
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DIY.. what you asking is pretty simple and stuff you should know anyway.
You need a chainwhip, cassette tool, chain breaker tool and some allen keys, grease. Sorted.
http://www.parktool.com/repair/readhowto.asp?id=48
http://www.parktool.com/repair/readhowto.asp?id=25
http://www.parktool.com/repair/byregion.asp?catid=14