[ ] "Do it or not. There is no try."
A boss once gave me what I thought was an impossible task. I said, "OK. I'll try." He explained that I would finish as long as I didn't quit. Trying didn't enter into it. Persistence was all that mattered.
Often someone says, "I'll try..." because it gives the person an out. Once the person says, "I will," his or her perspective changes. What previously seemed insurmountable is no longer a matter of luck or chance but of time and effort and persistence.
When what you want to do really matters, never say, "I'll try." Say, "I will," and keep that promise to yourself.