If you start a job or commit to a contract, you have to finish. But for personal projects or trying to build habits, you only have to start.
We get so caught up worrying about finishing, that we allow that to be a barrier to getting started.
Almost always, getting started is the difficult part, getting finished is pretty easy.
So, unless you’ve signed the contract, don’t worry about finishing. Concern yourself with getting started and the end will take care of itself.