I want to start a higher difficulty but my only HUGE concern are seals. In normal it's so hard to get second seals early in the game. I'm trying to get all the skills I want on my units and I can't so I have to keep leveling them up which will make it harder for them to level up later on since they have the whole 'hidden level'. How do you get seals in the harder difficulties? Do you just have to wait until they sell them in the shops later on? :/ That would be a bummer.
Aren't Rift Doors just as rare as seals early on in the game? lol Though I did notice that in Hard you get more items
Rarer, given that you NEVER get handed a Rift Door normally. --- There's always hope for better things in life. But you can't let anything, friend, lover, God himself, be your hope. You have to be your own hope.
you can get two second seals early (one in ch8 and one from renown). master seals are a bit of a problem but you start getting them in bulk in ch8-12 (when you can buy them).
just finishing the story, you certainly don't need more than you can naturally get (meaning, you don't need to Anna abuse). and if you're using the DLC anyway, grinding out levels later when the Seals become purchasable is not a problem -- you're talking a minor difference between internal levels.
if you're not using the DLC, it will mean some tough decisions but real bottleneck is Master Seals then, which are purchasable much earlier.