QUOTE(Reventon @ Mar 11 2013, 08:50 PM)
1. Yes you can flash without any problem.
2. Do a nandroid backup before you flash anything just in case.
You need to root your phone and get cwm or twrp recovery. Then just flash away

Noted with thanks. One more final question before flashing the rom tonite
1. After flashing the rom, I believe everything will be wipe out, right? Can I use titanium backup to restore all my apps, sms, call log, contact, calendar event, alarm, settings, etc?
2. If I have nandroid backup, I can restore back to original stock rom state (everything will looks the same as before), right
I am a little worry that all data will be gone since this is the first time I'm doing rom flashing.