For me NES games are really hard lol, ability differences I guess.
Nah, it is not necessary, after each boss you just enter in the blue light and done, just have to take care of not touching the heart container right after you defeat the boss, because of bad luck you can appear near of it, so saving before the battle is a good choice.
Idk if with Majora's it is the same case, but I played the game on 3ds recently and I'm pretty sure it was possible to just continue without the container.
Now that I have the Nintendo 64 I want to complete both games with 3 hearts, so wish me luck haha.
Honestly I didn't like Majora's Mask. I thought it was the dumbest of all the Zelda's. It was fun though rolling around the world as Goron Link with those spikes annihilating everything in your path like those weird bubble creatures called Chu Chu's.
I do know if you play Ocarina of Time with only three hearts there are creatures that can kill you with one hit. Like Dark Nuts. One whack from them takes 4 hearts. Use Bombchu's to fight them. It is cheap but it works. Don't whack them to wake them up so they can come after you. Stand at the other end of the room from them and start sending Bombchu's their way. The Bombchu's will blow them up before they come close to you.
That is a very unpopular opinion lol, but it is understandable though.
That Bombchu's strategy sounds good, I'll remember that for when I start my 3 hearts run, thanks!