agree with all the above, especially time off and holidays. Book some holiday and stick to it. Its easy to say oh ill just do that little job for mrs so and so and suddenly the whole weeks gone. Keep sundays to yourself and the family.
couple of other points
1:- get a decent accountant (my ramblings on this are well documented) Dont pay the tax man anything more than you have to (online payemts etc) keep every receipt etc and claim everything you are entitled to. They will svae you more money than they will cost. Always pay them on time and if you go vat registered ditto!
2:Get in with some local suppliers. they will do you deals once they get to know you and start to recomend you as they soon work out who is decent and who is not. Its not worth running around between several suppliers because A does his washers 2p cheaper than B. time is money
3: If you advertise, ask people where they got your number from when they contact you for a quote. Put the phone down on cold callers selling advertising. they offer the moon, cost the earth and give nothing. I read an article by Anita Broderick (body shop women) who said dont waste money on advertising too much these days. Theres too much out there. Pick tried and trusted ones. Also think about how far you want to travel. Theres no point paying for an add in a county wide paper if you dont want to travel that far.
4: Be polite, honest, punctual and tidy. Let people know if you will be late and always tidy up when you go, they will notice that more than the job you do!
5: Always Always Always do a quote on paper, even if its only for a £25.00 job. Have some basic terms and conditions and Always Always Always get them to sign them before you do the work.
6: There are always people out there willing to give new businesses a leg up. Always explain to suppliers, printers etc that you are a new business. It is suprising what discounts and help they will give to earn your loyalty.
7: Keep a seperate bank account for the tax man, and always put a little more in it. Its a noce feeling knowing youve got the tax bill covered, and a little extra in there.
8: Speak to the bank and arrange any free banking you can. they will be more than helpful to get your new business.
9: In any business there is always another hurdle to get over to go to the next level eg buy a new van (can you afford it) take on a labourer (can you commit to it etc etc. Always consider it and look at all the options. Whenever ive done it ive always worried about it and then 6 months down the line you think, god how did i ever do without it etc. Its a risk, but taking it in a calculated way makes the difference between a succeding business and one that plods on.
10: Enjoy it. Thats why your doing it. Enjoy the freedom of chosing who when and where you work. If you dont like the look of a job walk away (you may be wrong, you may be right, but id rather be wrong and have walked away then the other way around). Its hard work and sometimes you'll wonder why your doing it when youre bogged down in paperwork. Other days you'll do a job in half the time, get home early and look at the cheque and think "i earnt that and its all mine" Its a nice feeling.
Good luck