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Let's do a little thought experiment here, Brian...try and follow me. Put yourself into the surface of a balloon. Now as it expands when the "big cosmic guy" blows it up (and ignoring where he is because you can't see or even know about him), look out into the space you occupy. What do you see??. Space is expanding away from you in all directions. Now, leave a beacon where you are now and then move a distance "x" away in any direction you care to go within that space. Look around you and also look at the beacon you left behind were you once were. What do you see??. Space moving away from your new position in all directions, including the direction looking towards your beacon.
That is what's meant by the "centre" of expansion is everywhere. Because you and every point in space is moving away from one another due to the expansion of that space. It's not only an expansion of physical dimensions, it's also an expansion in time and that's why it's difficult for some to visualise what's happening. Time, in this case, has to be visualised as an actual physical dimension like length and breadth in order for you to be able to see the results of the expansion.
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