I don't know you but from the other posts it seems you are a craftsman.
I followed the self employed route 15 years ago and the hardest thing for me was accepting the fact of no more guaranteed monthly salary, no holiday pay, co.car etc. Once I'd got my head around that and set out my stall properly it was ok.
It took me years though before I could stop myself accepting every job offered as in the back of my mind I worried if it would dry up. Didn't matter how much work I had in advance - sort of panic mode I guess!
Eventually I learned that if you produce quality work and value for money (not the cheapest price) you will soon gain a reputation and word will get around very quickly. You need to factor in time for tool maintenance, planning & estimating as well as visits to customers and it's always more than you think.
If you're positive and look busy, then you always will be, customers will wait and are often suspicious of a tradesman who "can start tomorrow" unless you have a very good reason. The best way to be successful is to find a niche market.
And... the customer isn't always right, you just have to careful how you tell them that.
And... be careful to vet your customers before laying out money and time. get some payment up front so they're committed - one bad debt can kill your business flat.
I won't deal with people i don't know or who i haven't been directly recommeded to by customers and if I have any doubts at all, I walk away.
Hope I'm not preaching to the converted, I'm sure you'll do well.
Best of luck fella
Bob