One of my favorite concepts is that people overestimate what they can do in a day and underestimate what they can do in a year. It took me two years to launch FiberCrafty which is CRAZY but I just kept chipping away and moving forward.
"Start from a place of stability if possible. If you go all in and it doesn't work out quickly, it's quickly going to become a train wreck of freaking out. Either have a lot of money saved up, or start it as a hobby, because "I'm going to lose the house if this doesn't work out" is going to cause bad decisions. You'll end up doing whatever it takes to survive one day more, even if it dooms any sort of long term viability."