You really have to play Origins. It's just as simple as that. Any difficulty you like, but preferably Normal. Go into the menu, turn off Auto-Target, Battle Support and all those other things that slightly decrease the difficulty level of the game.

Origins has the same difficulty level as the NES version and a fantastic new menu system to pretty much eliminate all of its clunkiness. It truly is the best version of the game. Well technically the WonderSwan Colour version is (Origins is just a translated port of it) but that's Japan only.