I am naturally organised and feel quite panicky if things are chaotic. The best way to describe my life (or house) is boxes within boxes within boxes - that is, the rooms are boxes (within a big box, the house!) and there are 'boxes', or places, within each room. The absolutely vital thing is to have a place for everything.
Shelves in the alcove in my office for paperwork files ie lever arch folders with dividers for each category and the names clearly written on the spine. I also keep a notebook for each in which I record every convo with eg the bank, utility companies etc and keep in the appropriate file in a polypocket at the front. This is so I can say with confidence "On 5th April at 3.45pm I spoke to Natalie who said..." . I have an inbox for paperwork on my desk with I file every now and again - no set time.
Direct debits are essential to keep track of bill payments. I also keep an A4 notebook of receipts - stapled in with a corresponding dated handwritten list on the facing page - and a typed monthly direct debit/standing order table, which I tick off when each is paid so there are no nasty surprises. I got into this when money was very tight and I had to watch everything but it is a great system because I can find the receipt for everything (and, I admit, also periodically collate tables of spending in each category eg petrol, food, clothes, eating out etc to check where everything is going and if I'm overspending - but I know this is a bit anal..).
If everything has a place and everything is in its place, you can follow that invaluable maxim when you are tidying things away, which is to touch once - ie it is common to pick things up and put them down somewhere else, literally moving mess and clutter around: if the item has a 'home', you pick it up and put it immediately where it lives, touching it only once in the process.
I have a calendar on the wall in the kitchen which I can see clearly and look at frequently and everything goes on there using different coloured pens eg birthdays in red, filled out at the beginning of each year from the previous calendar. I need to be able to see it as I don't get on so well with diaries, electronic or physical, which are hidden away in my bag or my pocket. There are numerous pen pots in the house by eg the phone (which is right by the calendar) and I write in appts the minute I make them. When there were loads of us living in the house we had a family calendar with columns for each person.
I keep a block of post-it notes by my bed and in the kitchen, to jot down things to remember but my main reminder is a small moleskin notebook I keep in my bag. I write in appointments made while out (or leave myself a voicemail on my landline) and general notes and info to transfer when I get home. It is also my list book of things to do that day, to be transferred onto the next day if they aren't done.
I have a box of presents in my wardrobe which I stock up throughout the year - this Christmas I didn't buy one present in the run-up because I had them all already. I also have a box of cards which I also collect throughout the year when and if I see them. Book of first class stamps in my purse.
Clocks in the house 5 minutes fast, 10 minutes fast in the bathroom. My watch and car clock are 5 minutes fast, alarm deliberately vague but always fast by approx 10 or 15 mins. If I have to be somewhere at, say, 10, I aim to leave the house at 9. Though I got that wrong this christmas and arrived an hour early for a 6.30am shift...
I do all of this because I want to run my life and not have my life running me! I am inherently lazy and don't like to do more than I need to, want to enjoy my life and not be run ragged chasing after it, feeling crap that I'm getting everything wrong. As a young adult I was totally chaotic and at least an hour late for appts or plain didn't arrive at all. I hated living like that but tbh it was being a single parent that knocked me into shape. I had no choice really.