I was on antidepressants for almost a year (Celexa/Citalopram) and had a pretty hard time weaning off them because of side effects. All the literature and medical advice says do it slowly and go according to your body/moods. As a rough guide, I cut my dose by 1/4 tablet every 2/3 months. I used to be on one tablet/day. It took me a good 6 months or so to get off them and I wont lie to you, it was a pretty rough time.
I felt REALLY crappy for 2-3 weeks every time I lowered my dose (flu like symptoms, headaches, dizziness, nausea all day, every day), so set my weaning goals lightly, always paying attention to how I felt mood wise when I had levelled out again. ie. After 2/3 weeks of feeling crappy, I would level out again and stay on that lowered dose till I was ready to tackle another reduction. The last 1/4 tablet was the hardest, and I remember reading about people shaving minute doses off their tablets and weaning a shaved dose at a time.
So my advice is do it slowly, take your time, there is no hurry. Drink plenty of fluids to flush out your system and take a good Vitamin B complex, as anti d's lower your B's.
The anti d's really helped me at a time when I was at my lowest and I am so thankful for the help they gave me at the time. Now I am off them, I definately feel more in control of my life and can actually feel the emotions that come with life. Best of luck to you and remember if you start feeling depressed again, go back to the last dose you felt fine on and sit on that for a while.