I did the scariest thing I can imagine: I resigned
The good news: If you think you've done the right thing, then you have. Congratulations!The other news:  - Your runway is probably 50% of what you think it is.
  - Your task is probably 200% of what you think it is.
  - It will take 200% of what you expect to get your first customer.
  - Your wife will get scared before you do.
  - Some customers will take forever to pay.
  - You'll probably have to backtrack on your design / architecture.
  - When you need to sell, you'll want to code.
  - When you need to code, you'll want to sell.
  - Your MVP will be missing something critical.
  - At some point, you'll question your decision.
  - At some point, someone will discourage you.
  - You may need to pivot your entire business.
  - In a year, you won't be who you are now.

I don't mean to discourage you. I just want you to bottle that enthusiasm for later use. You'll probably need it.Best wishes![EDIT: Changed "less than good news" to "other news". Thanks grannyg00se and untog for pointing out my "less than best choice of words". wasigh, it's all good news.]