Buy a "finger socket wrench" at one of the auto supply stores (I forgot where I bought mine - Auto Zone? Pep Boys?). It's basically a socket wrench, but without the straight piece.
Use a 7mm socket (I think that's what it was).
Pull the plastic up a little bit, for easier access.
And, of course, have the hood up, so you can reach it more easily.
It was still a bit difficult, but do-able.