There's always a good excuse to do things later and better. However the easiest way is to do it just now and well enough.
|Just do it. Now is the best time!|
Imagine you have a presentation to prepare, doing it just now's the best way to keep it an short task. Waiting until the last minute will only make it more painful and risky as you won't have time for any updates if needed.
Now the best time to get into motion. However hard it may be to get started, the rest will follow. If you refrain it, it'll only make it make it more difficult later on.