Just a nugget.
A business idea without proper management plan is one that can be considered to be dead on arrival. Business success revolves around excellent management plan first before capital size. With a large capital chunk into any business that's lacking in proper planning, such business can inevitably collapse, turning into a wasted investment.
But on account of proper management structure on ground with even the small size of capital, it can be sustaining to such business's success in the long ... Experience should be considered as a key asset in business planning and as a key factor it's important to always involve those with experience in the area of business when planning. Never neglect this!
Yes, I totally agree. Many successful entrepreneurs today didn't start with a large pile of money, but their ideas, vision and knowledge. Though I feel wanting the perfect plan can be a hindrance, one may continue to plan without taking action. So, I'd say make a realistic one, it doesn't have to be perfect, and start your business. Perfect plan or not, one is bound to make mistakes and meet downturn in business. I think that is inevitable. But you can always prepare for it with a proper risk management plan. Same thing applies for experience. Waiting for all the experience, you may not retire early. You may not start early. Instead employing people who have those experience and who are smart enough for their individual tasks would go a long way to help you. You don't need to know how to do everything. One important skill I think a successful entrepreneur should have is the ability to spot a good and up-to-the-task manpower and the ability to lead them.