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Easy, see the Hacker’s Diet: https://www.fourmilab.ch/hackdiet/

Basically, control your calorie intake via calorie counting, measure your sliding weight average, and adjust your calorie intake up or down accordingly. It doesn’t matter how accurate your calorie counting is, as long as it’s consistent. That is, you can ballpark a lot of things as long as you’re repeatedly using the same estimates.

Counting calories is the only way I personally manage to lose weight, and it works very well. A simplified version of the Hacker’s Diet I use is the following: First count your calorie intake for a week or two without changing your diet, to establish a baseline of your average calorie intake, and then reduce the intake to 80-85% of that baseline. You’ll slowly be losing weight.

You can go lower (e.g. 70%) if you are able to sustain it and are in a hurry. It helps to pick food that is easy to calorie-count, of course. Reducing carbs generally helps with sustaining the lowered intake, and increasing the ratio of protein (and doing resistance training) helps with not losing muscle (or even building up some).

The mechanics aren’t difficult. You only need to muster the motivation.