Motherinferior - totally agree that it is impossible to talk to people with little ones about - luckily, other than the initial briefing and the odd meeting, my job is very self contained and I rarely have to talk to anyone! If I did have to talk/interact with people on a daily basis I would def. have formal childcare organised or it would be impossible.
I think what I meant, but didn't properly express, is that if you have a passion for the work PLUS support then over the SHORT TERM you can make the necessary sacrifices in order to have a freelancer career feasible. In my case, I am prepared to spend a few years working until 4am where necessary and fielding my kids off left, right and centre because I know (or hope) that when they get to school age, I will have more enough time (during the day) to do my job effectively plus be at home for ds and dd. Also, I don't have any choice. My job is freelance in nature whether I want it or not - I spent 14 years working from home before having ds and dd because that's how my job works.
Having said that, it is NOT easy while they are little. When I have a pressing deadline I am a nightmare - and my kids really suffer. At times like that I wonder if I have made the right decision. In many ways it would be easier to have a 'proper' job which involved leaving the house - at least then dd and ds would know where they stood. This way, they never know whether they are going to have a SAHM or a raving, stressed maniac for a mother.
Still think you should go for it, flashingnose.