While the effort is appreciated, the guide seems excessive and partially inaccurate.
Look at what you posted:
Quote:
Originally Posted by Tilde88
4.Begin the Flash process.
5.Be ready to unplug the USB from your device as soon as the computer signals the USB has been disconnected. Wait about 8 seconds... Feel free to click the power button a few times while you wait 
6.Put the battery back in, but DO NOT POWER YOUR PHONE UP YET!
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How do you put the battery back in, if it was in already?
If you are really worried about a "clean flash", I would suggest the following process instead:
1. Flash to your ship rom
2. Let it load until the first "tap here" screen
3. Plug in phone and flash custom rom.
4. Let it fully load, and then do a "clear storage" -- start>settings>system>clear storage
5. Let it fully load, and enjoy.
Honestly, however this is often not necessary, especially if the chef of the custom rom uses a good xip based on the stock rom in the visual kitchen.