Just quit my office job. I'm going to France in July to spend two months cycling. When I come back I am intending to start a startup (though I still have a few ideas I am trying to decide between). I will probably be working part time as well.
Daydreaming about it won't get you there! I have never traveled before doing this trip but have wanted to for years - I kept on putting off because it wasn't the "right time" etc.
A few months ago after deciding to leave my present job, I finally made up my mind to go for it before having to find a new way of making money.
Having made the decision everything has just fallen into place since. I have discovered that making the decision in the first place was the hardest part and I think this probably holds true in many aspects of life.
Another thing you will find when you decide to do something like this is how much your peers support you. Apart from a few negative types everyone I know has been really encouraging and offered to help me where I needed it.
I wish you well with your plans, but start doing it instead of dreaming it! :)