I'm not sure how bad a blind playthrough can be since I watched my brother play it a million tries before my first run.
But yeah, DO NOT LET THE BLACK KNIGHT GET YOU IN CHAPTER 11!!! And there is a certain named vigilante in that chapter you can recruit with a laguz.
Chapter 15: Don't kill many laguz. There are items everywhere. Avoid bringing knights and horsemen (obviously). That laguz recruitable guy is a hidden interaction, and if a beorc (human) goes there, you will get an item instead.
Save Bonus EXP for Astrid, Nephenee, Mist, and Elincia. They are some of the best units in PoR and in each of my runs were very RNG blessed, with Astrid easily capping Skl and Spd as a paladin by chapter 18 due to paragon. And Astrid, Nephenee, and Mist were dodge tanks as well. I recommend giving Astrid lances upon promotion, but stick to bows if possible. Mist should keep Tanith's Sonic Blade since it's the best weapon for her.
GOOD LUCK!!!
EDIT: Didn't read everything. Congrats on beating the game, though! It still stands as my favorite Fire Emblem game.
