Each week, set a goal weight that is 1-2 lbs lower than your current weight/last week's goal. The leaner you get, the harder it is to lose, so having a goal of 1 or even 1/2 lbs can be good for lean people. I'm 6'4" and decently athletic. Right now at 190, I'm starting to show abs, so my goal rn is 1/2lb per week.
Each morning, wake up and weigh yourself. If you are at or below this week's goal weight, great! Have a nice breakfast. If not, no breakfast. Then, skip lunch. Sometime in the evening, eat dinner. No need to beat yourself up if dinner isn't perfect, but obviously, eating tacos at home is better than ordering a pizza.
Using a little text document on your phone or whatever, write down everything you eat every day. I hate estimating portion sizes, and instead just record for the sake of tracking food quality - typically if I eat pizza and beer and cake, I gain weight, lol.
Each week, review your progress and your food log. Did you achieve your goal? If so, celebrate! If not, review your food journal. Ask yourself - did you cheat or eat unhealthy foods? If so, why? And do you regret it? I think it is fine to have a slice of cake at someone's party every once in a while, and I don'r regret that it might slow my progress a little. But if I go to McD's 5 nights a week, then I'll regret that. So then, you reflect on why you did the things you not regret, and ask yourself if there is some way you can make it easier to avoid these temptations in the future - like having dinner made already at home (crockpots ftw!), or finding a way to reduce stress in your life so you are less interested in binge eating.

I will also note that I exercise quite a lot. I lift, I go rock climbing, I go hiking. Sometimes I play hacky sack or pickleball or ultimate frisbee. I recommend exercising as well - it isn't necessary according to CICO, but we all know it helps. Find some kind of fun, social exercise that you can keep coming back to and enjoying.

Another note: many people will feel like the progress I've made is quite minimal and slow. In my defence, (1) I'm already pretty lean relative to most people with body comp goals (2) this has been an extremely painless and very sustainable process and (3) losing weight slowly is the way to go, as it preserves muscle mass and ensures your diet is sustainable long term.