If you start something with the hardest task, you will quickly wear yourself out. You need to start with things you know you can do with a minimum of effort. Working this way means that you don’t fall at the first hurdle, and that will give you more confidence. Work on today and leave tomorrow until the time comes.
From the beginning surround yourself with positive people. You want to feel good about the project. Decide what the basics are, get them right and then you can build on them.
Paying attention to the small details is something that some organisations forget at their peril. On the other hand, it doesn’t pay to get carried away with the small things when they don’t matter. Put perfection to one side and just think about improving bit by bit.