Upgrading to 8gb ram in late 2008 mbp fools errand?

Hi There,
I've just ordered some new RAM from crucial.com (on advice of an apple genius). I used the diagnostic and ordered 2X4GB RAM (1066mhz). Have i made a mistake? In some places  on this forum it suggests i should only try to go up to 4gb (i've currently only got 2gb), in other posts it suggests 8gb is fine.
I'm looking for some advice - do i contact the seller and try to change my purchase or plough on with the higher capacity RAM?
Cheers!!!

Cheers Kappy,
I should have done although lulled into a false sense of security by recommedation from apple genius!
Thanks for the help.

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