So here’s something I came up with that might help not having to micromanage your budget.
First of all, I automate as much of my finances as possible. My paychecks are direct deposited into my checking account and 401k each month obviously. I pay for everything with a credit card so that it tracks every purchase (I also get cash back on it). Nearly all my bills are set up to auto pay each month. I have a separate savings account where every couple of weeks, a certain amount of money is transferred from checking to savings.
My bank has overdraft protection so money is taken from my savings account to cover overpayment in my checking account.
So my checking account is effectively my operating account where I only need to keep enough money in it to cover my bills each month. My savings account becomes a sort of combination sweep account for storing extra cash up to about 6-12 months salary. Above that, I then look for something to invest that money in (stocks mostly).
About once a month, I update Quicken as well as an Excel workbook I created to get a snapshot of my finances and make sure everything is in order. It’s all highly categorized so I know what and where I spend my money.
So the part about not having to micromanage every purchase. Do a budget and see where you spent your money for the past year to estimate your future spending patterns. Subtract known fixed expenses like rent/mortgage, cable, internet, streaming services, electricity, phone, etc. Subtract average spending for more variable but regular and relatively stable necessary purchases like gas, commuting costs, lunch, etc.
What you have left should be how much cash you have left for random stuff like unexpected car repairs (assuming you didn’t account for this already), coffee, dining out, a new book, whatever. Then divide this by the number of days (or weeks) between paychecks.
So let’s say that number is $50 a day or $350 a week. Then you know that on any given day, you don’t have to think about a purchase of less than $50 because it’s not going to impact your budget. Or if it’s a bit more than $50, you can be like “I didn’t make an unexpected purchases yesterday so I’m still good”.