Details, resources, questions, and challenges
After you have produced an overview of your expenses - and recovered from the shock - try to avoid the urge to slash all costs.
As an example, the FIRE movement (Financial Independence, Retire Early) advocates for a stiff savings rate, allowing you to withdraw early from the job market.
Cool, sure, but don't overdo it. The downside is that you risk living in misery until you're 35 after which you can retire to .. a life of misery.
"I want to save 80% of my income and live off sardines until I'm 60" is not a productive conclusion of your review.
In the same vein, you strictly speaking don't need a budget, but if money flows out quicker than it comes in and you don't for the love of it know why, a budget can be a worthwhile tool to look into.
In short, be reasonable & do your homework before you take action - this Life Area deserves your full attention.