What I usually do is try to build a Character Table first so that you may scroll down and see where your text blocks are in a HEX program. In FCEUX, the PPU viewer in there usually does a good job at finding the values for each character as sometimes they may be mixed up. Windhex is a good program for windows that does text editing for the most part with usage of integrating a Table file into the HEX editor. Will make life much easier. In some odd cases because on one part of the game a character may equal one thing, in another part of the game it may equal something else also so sometimes you may need to make 2 separate character tables in this scenario. In Hydlide 3 for NES it uses 3 separate font tables so the values of characters are different at the intro, game play, and ending section of the ROM.