"Matt" wrote...
I've got a (new to me) 1992 Beneteau First 310
(http://coconut.ereidy.com/) that has some pretty severe weather helm
when the wind blows above about 15 knots. How realistic is it to think
that I can trim her up to the point that I can eliminate it? Is there
an order of preference in going about reducing it?

From cheapest/easiest:

Adjust your sail controls (cunningham, downhaul, outhaul, traveler) to
flatten the main and bring the draft forward.

Reef the main. Does it help?

Ask a rigger or sailmaker to look at your sails and rig. You may need
to have the sails recut or the rig tuned to move the CE forward.