I used to work in admin before becoming a childminder. I do more typing as a childminder than I did then! Its not for the faint-hearted, but it can be very emotionally rewarding. For me, becoming a childminder was the best decision I've made, but it doesn't suit everyone.
While you can do the school run as a childminder with your own children, other trips for your family like after school clubs, parties, playdates, also dentist/optician/hair appointments can be hard to sort out. Although I'm here, I've had to ask for lifts for my own children far more than I can offer them due to childminding commitments. (not having enough seats in the car, having to be home for pickup/drop off times/meals & naps etc). When your children ask to have a friend round, you have to make sure you don't go over the numbers on your registration & insurance certificates (unless the parent comes too!).
DH has worked nights before, he's a heavy sleeper so he wasn't disturbed by the children playing. You really need the support of your family - the reality of sharing your house with other families can be a bit of a shock to your children who have to share you and their toys, and to husbands/partners who thought they'd be coming home to a spotless house cos you're home all day (how wrong can you be lol!)
Go on a pre-registration briefing, they didn't have these when I started. But I would hope they give all the info you need to make up your mind one way or the other. There is a lot of support available, its not the isolated job it used to be. All the best, whatever you decide.