Decide...whether or not the goal is worth the risks involved. If it is, stop worrying.
No kind action ever stops with itself. One kind action leads to another.
There are two kinds of stones, as everyone knows, one of which rolls.
Flying might not be all plain sailing, but the fun of it is worth the price.
Worry retards reaction and makes clear-cut decisions impossible.
The most effective way to do it, is to just do it.