Don't get married. Don't have kids. You will be broke and living in a mess....
You can either have nice sofas or cats - not both at the same time.
Don't have anything which eats hay, rabbits, guinea pigs, horses (well don't have these anyway. You will end up supporting the local vets singlehanded...) The hay will get everywhere, and it will all tangle up in your hoover and every now and then you'll have to detangle it..
Don't go up the stairs emptyhanded.
Deal with paperwork / letters as soon as they come into the house. Then recycle / throw away.
Put stuff away each evening, even if you do seem to be chasing children round the house, as fast as you put things away they will get things out...
Do the washing /drying regularly. Don't let it build up - as soon as you have a washing machine full, put it on. Have enough white school shirts so you only need to do one whites wash per week (unless of course you have a lot of whites...)
Train your children how to put clothes away, put clothes in dirty clothes basket, hoover, wash up, load dishwasher, empty dishwasher etc from as soon as you think that they can. Don't let them get away with not doing anything round the house.
Outsource if you can. Windows, cleaning etc. Put stuff away if you have a cleaner so that they spend their time actually cleaning, not tidying. Having a cleaner means you will tidy up on a regular basis.
Everything should have a place, even if it's in the 'junk drawer' - then you will know where it lives and where to find it.
Have a charity shop bag on the go. As soon as children grow out of clothes decide whether to sell, rags or charity, and then once the bag is full, do something with it. Same with toys.
Only iron what actually needs ironing. I do 3-4 shirts per week, and that's it.