Assuming RM2K3 here. Database -> Classes -> (Pick a class) -> Double click the exp curve picture -> choose the experience per level tab. Now start playing with the sliders until you see what you want.
If you want to do it even more easily, edit the exp awarded from the bosses to give enough to give players the exp needed to go from the level you think they're at to the level you want them to be. E.g. if it lists level 5 as taking 100 exp and you expect the player is level 4, award 100 exp. That will admittedly leave the exp from grinding random encounters as the mere rounding errors that they are, IMO, right now. People who run from random counters will thank you, the others can still grind if they really want to, though grinding will still suck.
If the curative items were affordable, stuff like paralyzed would be okay, as it would just mean "the afflicted character is out until a clean character spends 1 turn bringing them back in." (I don't know whether tickled is a removable status, though.)
Bosses don't give exp.
I'm fine with raising exp and gold, and for at least level 1-3, I definitely would plan on it, but I don't think I have to do it too much past the first area. I think it's not too bad later on.
Yes it's possible to do that ,but if you fight against the Mimic for example ,you're going to use all your curative items ,because the last time I've fight against it ,it have just spam me with Tied&tickle attack ,making my characters tickled and paralyzed at the same time ,so healing one only make it able to be paralyzed again next turn :blink
Yeah, you're not actually supposed to be able to beat him for a long time. n_n;