Breaking an old habit

Lets say that for the past two days you manage to break a habit and knocked it out of your path to the curb.
Pretend that you are driving a police car. That old habit is standing on the curb waiting to try and cross in front of other drivers where it is against the law. But paying attention to what other drivers going your direction are doing is more important then paying attention to that bad habit. So keep your main focus on the road since 99 times out of 100 that old habit won't dare try to jaywalk in front of you; but, other drivers may need your attention.
Remember other important issues deserve your attention. Ignore that old habit and find other things to keep yourself busy. The prize is in the road ahead, not off to the side.

Although you want to be perfect in not giving in to the old habit, consistency not perfection (even where additive habits are concerned) should be the immediate goal. So don't let any one or two slip up(s) get you down. Experts say it takes 21 days to form a new habit, but I say one or two days slipping up out of 21 days would qualify for being consistent. Once there, you can easily strive for more perfection if that is necessary.