Introduction: Time to do this right. Any advice appreciated

I think you already know the technical bit: Log your food intake, correctly and honestly, using a food scale and accurate database entries. That's quite simple. You can even track macros in order to create nutritionally balanced meals, and prelog whole days, parts of days or several days. It's smart to schedule meals and cooking and shopping.

The hard part is to make the decisions, day in, day out, in the face of easier and more instantly rewarding solutions - to stick to your planned meals, not continue eating after you're done, not pretend "this doesn't count", or not panic every time you're not seeing the loss you expected, and either go back to overeating "because it doesn't work anyway" or stop eating altoghether, or do a "detox", as punishment or as a "kickstart".

You make the hard part easier by planning meals you want to eat (not meals you think you should eat), and eat them at times that fit into your day (not at random, specific diet industry prescribed times), eating in company whenever that feels natural, letting yourself enjoy whatever it is you eat, not try to be perfect, but to make small nudges in the right direction, day by day, meal by meal.

Not eating too much can feel liberating, but overeating can also be covering up painful emotions. Be aware that just about anything can pop up when you change habits, attitudes and environment. It can feel exciting and scary, as well as boring and uneventful. You can't be prepared for what happens, but you will handle it. Welcome