Do you "cross the bridge" when you come to it or develop contingency plans?
 
Idiom - Cross that bridge when we come to it    
"This is another way of saying 'we will deal with that problem when it occurs and not worry about it before'."
- http://www.learn-english-today.com/idioms/idiom-categories/problems/problems2-clo-getto.html

TIP #3: People, events, or other things could derail the best plans. Many people plan ahead or take steps in advance to ensure some areas/aspects of a plan occur (at some minimum level). This usually involves developing contingency/backup/alternative plans.
Developing a contingency plan could prevent a lot of stress, panic, confusion and last minute decisions. For example, when purchasing a condo a long time ago, I fully expected to receive a benefit/grant to put towards the cost. I did not receive the grant which led to a mad rush to obtain additional financing. The process could have been a lot smoother had I developed a contingency plan.