So, after looking at several NES ROM's, I've found it rather difficult to edit sprites and tiles, since they all look rather similar when 8x8. I've tried using multiple programs to attempt to arrange them (such as YY-CHR, with the 16x16 arrangement view), but this doesn't always help. For example, editing Zelda (NES)'s title screen is rather tedious from my experience, since many of the tiles look nearly identical. Additionally, other tiles/sprites from this game have an odd line on the bottom-most pixel row.
My question: is there any emulator out there that allows you to identify exact locations (in the ROM) of sprites/tiles currently displayed. If not, what is the very best way of going about doing this? FCEUX tells you ID's of tiles/sprites, but only in the PPU, not the ROM (where you, from my understanding, have to actually edit them).