The starting point is writing a list of direct debits. And adding them up and working what is left.
I was really bad lived from month to month, credit cards and loans. Not much in each but enough. Turned it around with a budget. It's quite satisfying saving when you get used to it. I also predicted likely out of pocket expenses eg dh birthday, Christmas. half term, etc.
have At least Three bank accounts is key
1 bills account (main bank)
2 spending account (starling or monzo are good)
3 savings account (I have two one to spend over the year on big ticket stuff and one for nest egg)
I Do a budget of things i need in the next month and other additional things in three months - including EVERTHING from hair cuts to window cleaning to holidays, gifts, medicine, dentist, clubs, nails, gym, socialising, garden, home.
Pets etc school trips.
I save £600 for Xmas by October. £ 15 a month for our dog. £25 a month for gifts.
The big ones Food -bills- cars -housing.
Now factor in Christmas and holidays
Then I saved a £1000 emergency fund so I never needed to. Put a car repair in a credit card or a vet bill on one too.
Then start paying any debt, smallest first (Dave Ramsey a snowball method)
In the first of the month I have a direct debit of spending money to the starling account (whatever you need mines 530). leave only enough for direct debits in the main accounts (most banks tell you this). Transfer the rest to savings. Pay day is irrelevant as it all should tick over.
In the startling I have pots for pets, trips, clothes, gifts hair etc