-As soon as possible, limit binky usage to ONLY when the child needs it and only after trying other soothing techniques first.
-Remove the binky within minutes of the child calming down.
-Try to keep baby well fed and well rested with a clean diaper. That will result in fewer fussy moments when binky is needed.
-Try to take away the binky entirely before the child in one year of age.
Those steps alone tend to work really well when used from birth, or a very young age (less than 6 months) but with some patience will also help decrease binky use in older children. I've found that Doodle is slowly needing her binky less and less, and will likely wean herself off of it entirely before she is one. I still bring it with me wherever I go, but find myself rarely using it.