That is you rationalizing your procrastination. I'm guilty of it more than anyone.

You read and read because you want to do it right. But if I were to put a table of various foods in front of you and asked you to point out the healthiest, you'd succeed. You know what's healthy to eat. You know what simple exercises there are to get started with.

You researching so that you can optimize every second is likely a bigger waste of time and energy than eating healthy meals that may not have perfectly optimal macronutrient ratios, or doing exercises that aren't fully isolating a specific muscle group.

Just get started.