Everything is good => just two good pieces of advice that I could add:
1. Get firmly cemented into the mindset that the opening study is MERELY a means to get to the middle game with an equal position at the very least, no matter who your opposition is (Garry or the guy down the street)
Anything else that an opening (or an author) promises is fake advertising. You will not "crush" your opponents with it nor will it hide the rest of the defects in your chess against a stronger player. They will surgically dismantle you no matter how booked up you are.
So whenever you feel you're going overboard with opening preparation,keep this in mind.
2. If you have long term goals and have a lot of time, try learning one new move for every game you played. That might ease the amount of information you are pumping into your brain. I've seen people claim that they can go over 4-5 opening tabiyas in 30 minutes and assimilate all the ideas, not sure how they do that or if they are rote-memorizing ... but it is much more realistic to play the game naturally, then during the post-mortem, look up where you or your opponent deviated from the lines and "learn" the one new move that keeps you in theory. The next time you play this line, you'd be able to confidently play one more "best move" in the opening. This also allows you to "gently" adjust the thinking that picked the earlier move and nudge it towards picking the "better" move. If you're not convinced that the book move was better, get with a stronger player and ask him.
Regarding your style => People at our level really shouldn't ever claim to have a style ... I'd re-word it to "type of game/system I have fun/feel comfortable with". :)
So look at a game where you had a lot of fun playing. Not one where you won or crushed somebody ... it could be a game you lost, but enjoyed playing,.
For me it is usually one where all the "natural" moves that I could come up ended up being good, where I intuitively understood the ideas and every aspect of the opening made near-perfect sense to me. For some, this could be a sharp line in a wild opening or for others, it could be a patient + safe positional improvement of pieces.
Figure out what's comfortable and "natural-looking" for you. Shop around with different types of games and you'll soon start leaning towards a flavor you like.
For someone interested in long-term chess development, how does one learn openings?
Here are the answers I have come across over the past several months followed by some of practical concerns/questions I have had in attempting to minimally include opening study to my tactics/endgames drilling...
1. Learn opening "principles": Principles are meaningless at my level since they are harder to learn for a lower-level player than specific lines. Is that not why concrete concepts such as tactics/mates are generally studied before strategy/positional play?
2. Learn "why" the opening move was made: At my level, this also means nothing...the "why" is because the commentator said so. If I truly knew and understood "why", I'd be at least a "weak" GM. And being able to parrot 11 opening principles does not mean one understands openings or knows enough to get to a decent middlegame position.
3. Do not memorize lines/variations/repertoires: But I will have to do so anyway eventually, so why not drill a GM-book repertoire starting now and use it for the next several years (likely won't be refuted by Expert or below players, right?).
4. Don't memorize traps since they are just tactics: Traps can be memorized by a weaker player and used against a tactically stronger player. Also, I wonder if learning traps/miniatures can be akin to studying master games, in that they help demonstrate the ideas of certain openings and tactical consequences that can arise from them.
5. Study open games first: Why not get a balanced early exposure to semi-open and closed game concepts also, especially since it must be done eventually anyway?
6. Study games of masters in your "style": How would a low-level player/beginner know what their style is? I like Tal's crazy attacks, but would also love an impenetrable fortess a la Petrosian/Karpov. How do I know my style until I have gained the necessary skill and experience to truly understand what style I truly mesh with?
7. Play one particular opening and stick to it for at least a year in order to learn it fairly well: Does this pigeon-hole me into a particular opening or style, requiring me to re-learn everything if I switch to an unrelated opening? Am I better off drilling the first 4-5 moves of dozens of openings to see the variety of positions that can arise (which may therefore help with my "general" chess development)?
Finally, even the great Bobby Fischer said something to someone about going through ECO twice as their "first lesson" and I wonder if it is not just about memorization but rather about the variety of opening structures/positions/ideas that one can absorb subconsiously just through seeing/playing through these various lines repetitively (drilling them either OTB or using chess positions trainer or chess openings wizard, for instance).
I appreciate any hear advice on the best balanced way of including openings in my chess training (which is primarily tactics and endgames, but I want it all), so I can stop obsessing about it. Sorry for the length. Thanks.