You need conviction in your own beliefs, and the willingness to ignore others naysaying.
It takes years and years, usually a decade, to create a great startup.
You can basically change everything in a startup but the market.
Many of the best YC companies have had phenomenally small number of employees for their first year, sometimes none besides the founders.
What being a founder means, is signing up for this years long grind on executionโ-โand you can't outsource this.
If you ever take your foot off the gas pedal, things will spiral out of control, snowball downwards.