@Colourful_Hippie: So you can change between presets by going to Triangle Menu > System > Change Difficulty, then selecting one with L and R, then hitting OK.
OR, you can go to any tab (eg the Current tab), and hit up/down to select the variable you want to change, then hit x. You're then given the options for that variable, and hitting OK after selecting all the ones you want sets your custom difficulty. You can then check what you've got it set to by viewing the Current tab.
So for me, I have Damage Taken to Great (1.5-2x), Damage Given to Small (.66x), EXP Won to More (5x), Money won to More (5x), Retries in dungeons to Use, Retries in battles to Don't Use.
@Epidehl: Good luck! I gave up on platinuming this game. I missed out on all-books because I said I was good at math to the Strength guys and hence didn't get that stupid missable one from them. I haven't had the luck to get a prize from the vending machines either, and I doubt I'll ever bother with save/reloading it (it's a 1/250 chance or so). In addition, I fused the entire compendium without getting The Nose to give me a single fusion mistake.
I wish the platinum had to do with actual achievements rather than RNG /missable stuff, *sigh*.
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