There are holes all over everything you say in this thread. That's the issue people are having. You seem to be well meaning, which is why I'm trying not to be rude.
I will give you my best advice, read everything, if it doesn't pertain to you well maybe some day it will. Maybe you can add some of that persons techniques to your set up. The fact you discount everything on here as bad advice shows you have obviously been looking in the wrong places.
Your log book isn't going to save you from overdosing your plants with nutrients, but some user on here may be able to. Read and take peoples advice, if you can't determine whether people are fit to give advice on your own look at their post history, or shop their ideas with other growers to see what they think. That's what forums are for, not to come to and write a post saying "Don't read anything here as it won't be the same for you".
I can tell you I have improved my growing 100% in the past 6 months because I read educated users here, was there some trial and error? Sure but being educated as to the proper practices and how to apply the knowledge I've come across has mitigated the risk.
I would have never learned about organics or how easy growing that way can be if I never read this forum, or took users results as a guide to my own success. My plants right now look 100x better then they did last year at this time and that's because of people here spreading information regarding amending soils and proper use of tea's. These steps have been working for me and a bunch of other people on here, they WILL work for you too, if you do it right and follow the information.
I used a log book for about a week before I gave up on that idea. You will find very quickly you remember the things you do wrong and the things you do right will become habit. The only reason for a log book IMO is if you are feeding different plants different brands of nutrients and you want to keep real close tabs on them. For your average grower a log book shouldn't be a concern at all, for those of us who aren't legal it's evidence and a damn good way to get yourself in way more shit.
Enjoy your time on RIU
Learn from the mistakes of this thread and you'll have a much better experience in the future