See my point was that if you know and understand opening principles they guide you through the opening so you don't need to panic. You'll always know a good response or plan in whatever openings you face and get reasonable positions going into the middle games. That's how effective opening principles are. You don't have to have the first 5 moves planned out. You can, but it's not needed for you to get a good game. Lets say you spend 15 minutes a day on openings. That's about 8 tactical puzzles a day more or less. Now most newer players change their openings about 3 times in my experience. So keeping it simple you play 1 opening for white and two for black ( 1 for e4 and 1 for d4) , that's 9 openings. So given two years time you'd study openings for 182hrs or you'd work on tactics for 182hrs solving around 5,824 tactic puzzles. I promise you, the tactics will get you much further than the opening study.
Your math is sound, but if I'm already spending 30 minutes to an hour daily on tactics, surely it couldn't hurt to put some minutes of pondering into the openings too, right? Obviously in the meantime I'll keep playing using the basic principles, but is spreading my time over the two subjects really that detrimental as long as I don't neglect tactics? If anything I would suggest that currently my tactical vision far exceeds my standard of play in the opening.
He violated the principle of moving the queen too early on move 2. Qf3. Now, the thought should be, develop while attacking the queen. Therefore, maybe: d6, Nf3, Bg4. You lost it on move 5 when you went down a piece. Move 4, you had to castle or play e6.
You might be able to survive this, but it will be hard and maybe impossible. On move 17, why trade queens? To disrupt his pawn structure? It's not that bad pawn structure, and your only hope to fighting back is to keep pieces on the board.
I lost the piece on 3...Nh6, I realized after the fact that Nf6 would have protected me just fine against his trick and allowed me to develop normally. Move 17 was in the interest of destroying his castle. I figured my best chance was to play mistake-free for the rest of the game and I saw a way to provide him with a weakness (open file to the king, doubled f pawns), that would hopefully balance out his two piece advantage some. Then he made some mistakes that let me clear the board, and I think if I had to focus on two queens as well, I would have blundered eventually. I was playing nervous the whole game after the 3...Nh6 blunder.