I use a different sized scrapers while the paint is tacky... not quite totally dry. I picked up a set of scrapers from Hobby Lobby on my last trip to Buffalo.
Here are a few projects where I've done the chippy finish using Annie Sloan Pure White.
These 2 bookcases are actually IKEA Hemnes I bought 10 years ago. Why sell them for pennies, when I could do a few coats of paint and make them look brand new!!