Questions Needed for the Single Founder Handbook

I'm in the midst of writing a book called The Single Founder Handbook (http://www.singlefounderhandbook.com) based on my experiences over the last 9 years running my own businesses as a solo founder. I'm soliciting questions from people who sign up to the launch list regarding what they'd like to learn about startups.

I'm trying to get as many questions from entrepreneurs as possible to ensure that I'm going in the right direction with the book. To that end, I'm posing that question here as well.

What 3 things would you want to know about running a business without a cofounder? In terms of timeline, this can be either before you get started, shortly after you get started, or well into it.

If you'd prefer to submit questions privately, sign up for the launch list and you'll get an email that you can reply back to. I've been capturing all of the responses in a spreadsheet and it's been extremely helpful to see what people are having troubles with and has really influenced the direction and tact I'm taking.

Thanks!