This is an interesting discussion to me because I was thinking about attempting to do a sort of remake of the original LoZ in Game Maker Studio. I just wanted a fun project to sharpen up my programming where I won't have to do all the graphics, etc. Though I'd probably modernize/add some accessibility options to it, and wouldn't try to capture all the weird glitches and exploits folks have discovered.
But yeah, when I played it again (about 5 or 6 years ago) after not playing since the mid-90's I found I didn't need much of a guide outside of very specific things. The game DOES tell you about most it's secrets, but usually you have to buy multiple hints from random people you find in caves and even then they're pretty vague. Looking up a scan of the manual isn't a bad idea though. It has some really rad art.
I finished my game just in time! It's Match3 meets Breakout, and was inspired by the videos of stuff like Money Puzzle Exchanger and Tetris Battle Gaiden. Though it doesn't really have any references to Giant Bomb. It's two player though! I never made a multiplayer game before so that was fun knocking that out today.