Very freaking easy... all you need is read Uncle Benny Blog
Read Using ODIN 1.86 to flash 4.0.1 only
Then wait for OTA to 4.0.4
Uncle Benny Secret Recipe

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Added on March 31, 2012, 5:37 pm
Game is so-so
There is no reason to get this tablet... Unless your home theatre using Sony! then this tablet is a overprice super remote control.

Another reason is play-station certified which hypes PS gamers...

SO are you a SONY man?

I have no idea, but if you want to do that. You better unlock bootloader and flash... via fastboot.
That method is just flash yakju 4.0.1 into your phone then only you wait OTA for 4.0.4...
Or else Galaxy Nexus Toolkit v5.6, best tool for us~

Urm, give some reviews for 4.0.4 stock
People said it's blazing fast and superb in-terms of performance.