I agree that it depends on the dose you have been on, how long you have been on it and the individual patient. When I was on higher doses early on, we would decrease by larger amounts. Once I got down to 5 mg (after almost a year), the rheumy said we would have to do it by 1 mg each day or else I might really notice, and I did.
And now I'm back up to 10 mg again...don't know that I'll ever get off of it, as it's already been 16 mos.