Before we stress ourselves, let's understand if this actually matters.

"New physists need to learn about earth, wind, and fire first, then we'll teach them about the periodic table."

Not all worthy goals take the same amount of time to accomplish.

If you find that you can improve the way you're working, don't wait.

Would you hire someone to learn to play chess for you?

It's like mixing the eggs and mixing the flour as different parts of a cake recipe.

I'd never have thought of this during a design phase.

The only way to get accurate software development estimates is to do the software development.

What learning are you missing out on by waiting until your product or feature is more perfect?

If we reject everything that's easily "done wrong", what's left?

Unless you enjoy the challenge of blind-folded piñata-style refactoring, write automated tests.