Can I get one veneer replacement done at a time?

If you are thinking to have porcelain veneers, it is best to have them all done in one time.

The reason being:
You will have less time in the dental chair.
the color and shape of your porcelain veneers will be matched far better!
You will not be needing a custom dental work for each veneer, consequently not absorbing further cost of color and shape matching by your cosmetic dentist.
In a nut shell do not do your dental veneers one at a time. You will not be happy.

-- 
Dr Anthony Mobasser 
Reconstructive & Cosmetic Dentistry
9201 W. Sunset Blvd suite 618,Los Angeles Ca 90069
P : 310-550-0383