On 19 Jan 2007, "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.

Adjust your sails appropriately.

How realistic is it to think that I can trim
her up to the point that I can eliminate it?

Assuming you're referring to more or less constant even if somewhat
variable "wind . . . above about 15 kts" (i.e., as distinguished from
a prevailing wind of notably less than that and only a
fleeting/episodic gust in that quantity - although, even then, one
generally ought not expect any lasting/annoying weather helm), its
mostly a question of sail appropriate trim.

Is there an order of preference in going about
reducing it?

You haven't specified point of sail or any other sailing conditions
besides what you imply is +/- 15 kts true. Experiment, including by
looking at the tell-tales.

Thanks, -Matt