TOUCHWIZ BASED ROMS (CleanROM/Synergy ect.):
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If you have CMW 6.0.X.X
1. Select wipe data/factory reset, click yes, I do this step 2-3 times but 1 usually is good enough, click yes, let it run and go back to home
2. Select wipe cache partition, click yes, click yes, let it run and go back to home
3. Select advanced, wipe dalvik cache, click yes, let it run and go back to home
4. Select mounts and storage, click format /system, click yes, let it run and go back to home
5. Select install zip from sdcard
6. Select choose zip from sdcard
7. Navigate to the directory where you placed files
8. Select the ROM file (ex: CleanROM2.0), select yes to flash
9. Some ROMs use AROMA installer which allow you to select options, if so select the options you want, and let it install
10. Go back to home, and select reboot system now and profit!
The hard part is done, now wait for your phone to boot. IT WILL TAKE LONGER FOR THE FIRST INITIAL BOOT AFTER DOING A FULL WIPE LIKE THIS. DON'T PANIC OR FREAK OUT, JUST LET IT RUN. Once it boots up, follow the on screen prompts to activate and you can begin to set your phone back up!