half the battle
US /hæf ðə ˈbætəl/
UK /hæf ðə ˈbætəl/
1.
a significant part of an effort or struggle, often implying that once this part is achieved, the rest will be easier
:
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Getting started is half the battle; once you begin, it gets easier.
•
Knowing what you want is half the battle when making a big decision.