Tapering off of .5 mg of klonopin after taking it for 10 yrs for anxiety and ocd. taking zoloft (sertraline) in its place. what withdrawal symptoms will i have?

Probably none: If you taper this med very slowly you should have no issues. You were only on a very low dose to begin with.

It sounds like a good plan. You may not have any withdrawal symptoms as Klonopin 0.5mg is a low dose, but if you do consult with your doctor. S/he might advise a gentle tapering like a half tablet (0.25mg) daily for 1-4weeks. If needed, it can be followed by 0.25mg every other day for 1-4weeks. Taking Klonopin for 10years may result in a psychological dependence and a gentle taper may be helpful