Just make sure you backup all the stuff you don't want to lose - photos emails etc. Better to be safe than sorry! Also, it depends how old your system is, you way want to do a fresh install. Good luck.
Only 3 years old and still runs way better than my windows machines ever did after same timeframe, so I'm going with the non clean install. Ive also had an external hd for time machine so I'm good there. Anybody know if it comes with an updated X11 and heard there might be some trick to QuickTime.
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Also, it depends how old your system is, you way want to do a fresh install. Good luck.