"Just do it"... but have a fallback plan for when you will, statistically, almost inevitably fail.
Granted, if you're on the technical side (and in SV or another "tech hub") then the fallback plan is usually "get a job with someone else within a couple of days of starting to look", but for that to be a reasonable fallback plan you still need to be careful during your startup time to not take on lots of personal debt, etc.
Granted, if you're on the technical side (and in SV or another "tech hub") then the fallback plan is usually "get a job with someone else within a couple of days of starting to look", but for that to be a reasonable fallback plan you still need to be careful during your startup time to not take on lots of personal debt, etc.