I tried it but it wasn't easy mostly because those clients are like every other client: they will try their best to get just-another-small-thing from you. So be

I tried it but it wasn't easy mostly because those clients are like every other client: they will try their best to get just-another-small-thing from you. So be prepared to deal with feature creep. For me it was also annoying that I couldn't get my idea out of my head so I had no motivation except for the money to work on anything else. My advice: get a full time job on a small web company for a year. You'll learn a lot about everything business related and you might save enough to work on your own thing for some time after you quit.