There are several threads available that explain it very easily. You can do it without any help and you don't need to remove the bumper cover to replace the grille.
Do a search.
Do a search.
I can take apart a gen6 bumper blindfolded... where in NY are you?.. i'm in CT so I could drive down if needed =P
not for nothing, I enjoyed the read and it was helpful to meAll my work for nothing
Here is a thread I made on how to remove the front bumper: http://www.toyotanation.com/forum/showthread.php?t=234677
And heres a photo on what the back side of the grille looks like:
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