You can use your hyperfocus for this. I'd actually suggest having large paper and marker pens to draw out the process first, so you can see how your finances work - I don't find that things on a screen register with me in the way that physical paper and BIG BRIGHT LETTERS AND ARROWS do.
Streamlining things and automating processes works. I'll give examples with random numbers
1.0 MONEY IN
Bank NAME and DATE of pay (eg, 27th of month, 26th - 28th of month) AMOUNT £2800.00
2.0 MONEY OUT
2.1 Arrow to a box labelled PRIORITY BILLS (the ones where you'd end up on the streets/in prison/out of work if you didn't pay them)
RENT/MORTGAGE 1st of month Standing Order/Direct Debit £750.00
COUNCIL TAX 1st of month Direct Debit £200.00
Car Tax 1st of month Direct Debit £whatever the fuck it is to run a car
Car Insurance 1st of month Direct Debit Company Name and Renewal date of a month before it runs out £whatever the fuck it is
Parking fees/tolls/whatever the hell it costs
TV Licence (if you watch live TV) £whatever
Subtotal for box 2.1 £WHATEVER
2.2 Arrow to bills that make your house fit for habitation
Box of UTILITIES & Communication
Gas Direct Debit Company Name £100.00
Electricity Direct Debit Company Name £100.00
Water Direct Debit Company Name £50.00
Mobile Phone Direct Debit Company Name and renewal date (month early to give you time to reassess alternatives (£30.00)
Broadband Direct Debit Company Name and renewal date (month early to give you time to reassess alternatives) £40.00
Subtotal for box 2.2 £WHATEVER
2.3 Arrow to a box labelled common sense bills (the ones you'd be stupid to not pay)
House Insurance Direct Debit Company Name and renewal date (month early) £50.00
Animal Healthcare (Insurance or prepay plan) Company Name and renewal date (month early) £50.00
Subtotal for box 2.3 £WHATEVER
2.4 Arrow to a box labelled DEBT REPAYMENT
Name of Company and Total amount outstanding £50.00
Name of Company and Total amount outstanding £50.00
Subtotal for box 2.4 £WHATEVER
2.5 Arrow to box of ESSENTIAL EXPENSES
Food (Estimate)
Travel to work (Tank of petrol, cost of bus pass)
Cat Food (I suggest ordering it in bulk, three months at a time from somewhere like Zooplus, but in any case, you've got to feed the animals)
Cat Litter (Same, they're going to have to shit somewhere)
Washing Powder
Fabric Softener (if you use it)
Washing up liquid
Dishwasher tablets (if you have a dishwasher - also suggest a 3 month supply at once)
Cleaning materials (sprays/bleach/sponges/whatever)
Toilet Roll
Kitchen Roll (if you use it)
Shampoo
Conditioner
Soap
Shower gel/bubble bath
Deodorant
Toothpaste, Mouthwash and Toothbrushes
Subtotal for box 2.5 £WHATEVER
Everything else is to some extent optional.
At the right hand side, give the amount left after each boxes' total has been subtracted from the money in. Make it large so you can see it clearly at a glance.
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If you are still focused at this point (or at a later date once you're comfortable with this and can look at tweaking the system), you could use the other accounts for specific things -
One could be CAR EXPENSES - if so, you could set up a Standing Order for the Tax DD, the Insurance DD, Parking if it's a set amount and an amount to cover MOT and towards servicing/repairs to go into it, so that you know everything in there is essential for your car and must not be touched for any other purpose.
The others could be set up for specific things, but it might just overcomplicate matters.
Use Direct Debits and Standing Orders so you don't have to put any mental energy into fulfilling those financial obligations - the money leaves on the 1st of the month, you don't see it, you don't think about it, you can't spend it.
Remember that the amount on the right hand side is a fact, not a minimum target.
I know that people will think 'but you can do this electronically?' - seeing it in big letters in a diagram makes more sense for some people; it can be used as a structure for introducing a spreadsheet or understanding how to set up computerised systems in any case.