Absolutely agree with keeprolling!!!
And while you're discussing decreasing your medication changes with your psychologist (before they start!) make sure you're discussing the "what if's" (how it might cause problems) and have some coping strategies/plans in place for if x, y, or z happens. For instance if you start to feel....you'll........(phone a friend to talk, get out and about, do something distracting/relaxing such as.....??).
Although these things might not happen having plans in place may help you feel a bit more confident in both decreasing your medication- which should be real slow- and in the case that they did start to happen.
And make sure you've got a contact number/helpline or access to any help if you are really struggling at any point e.g. when your psychologist isn't going to be immediately at hand.
Not trying to panic you there (!!), but if you feel you've covered all eventualities it might help a bit??
And, yes, trial and error. Even if it can only get as far as a reduction in dosage for the time being, that's a good thing, right?
And remember, we're here for you............
Best wishes
Alison