You should be fine at that schedule. The dose is not all that high, but it is not low either. A low dose would be a person taking 0.25 mg once per day; I have had addicts who had pushed their tolerance up to 30 mg of Xanax per day-- and THAT is very high!
If you can taper at the dose you described, you won't have a seizure. A more common way, though, is to change to a longer-acting benzodiazepine like clonazepam, and taper that. If you have problems with the Xanax-- namely with having too much anxiety in between doses-- ask your doctor about the clonazepam method.
I have been on this amount of Xanax since early June 2008.