The first 90% of a project takes 90% of the time, the last 10% takes the other 90% of the time.
If at first you don't succeed - read the instructions.
My boss arrived at work in a brand-new Lamborghini. I said 'wow, that's an amazing car!', He replied 'If you work hard, put all your hours in and strive for excellence, I'll get another one next year.'