Plan the End
A great ending in a movie is Everything. No point in building up to a crescendo and then fizzle out to nothing. In life, there has to be a great ending too.
The ending is everything.
Plan it, consider all of the possibilities and permutations, all of the factors that could take the glory away from you and give the kudos to someone else.
Think far ahead and you will know when to stop.
When you have the vision and the intelligence to look ahead on your timeline and you plan your moves you will stick to the plan and not be tempted to improvise.
Get rid of anxiety and vagueness because these two weaknesses are the reason so many people fail to conclude ther actions successfully.
If you see the ending you will not deviate from it.