What is the best way to transition from developer to business owner?

The best way to transition from developer to business owner is to keep your day job while building your business on nights and weekends. Spencer Thomason recommends dedicating 15-20 hours weekly to your side hustle, giving up leisure activities like TV watching to focus on growing your passion project. This approach provides financial stability while you develop your business to six-figure revenue, as Spencer did with CleanRouter. He emphasizes being passionate enough about your venture to lose sleep over it, continuously learning, and focusing on making your product customer-centric. Only when your business generates enough revenue to replace your salary should you consider leaving your day job.