How do you level crafts?

[Nix]

Every now and then you run in a 1-3 level range where there are just no good leves. Find a decent synth you can make fairly inexpensively in a large quantity to get you past the rut. 40 and 45 leves are gravy. Not sure if there are any 50's, somehow I feel that final stretch is going to be the death of me.

Rely on your locals! Even though the actual synth xp may dry up a little, the bonus for completion is lovely

Now as for how I level. . . 1-40 I will farm the mats for if I can, leve if I need to fill a gap. But then 40-50 on locals only, sell the leve rewards for extra gil. The completion bonus usually hovers at around 3~4k per leve so it adds up nicely!