am I good enough?

All my characters are level 47 or 48

Ingus thief job level 99
Luneth ninja job level 20
Refia Summoner job level 18(all summons)
Arc Devout job level 20(all spells that matter)

I use a thief because they are always getting better equipment
Ninja is just super powerful
Bahamut(duh)
Healing(double duh)

do you think I am good enough to get to the final bos and beat the bitch

I think you might be a little low, but give it a try, you might win :)

I got kicked all the way back down the Crystal tower at level 60 (Didn't even reach the end fight). :(

I wouldn't waste my time if I were you.

Hum yeah, from what I've tasted in the final dungeon I'd level up at least to my fifties/sixties.

Level up a bit, unless you fancy a challenge;)

I'm level 55 I think with a dragoon, ninja, black belt and sage I think, whatever the top general mage is. I'd like to be in the 60's when I really start with the last boss. I'm in the palace and just finished Eureka.

i changed from a ninja to a knight(excaliber, ragnarok, and full crystal!) but do you think I should change back. If I change back I need to give my thief a black garb again instead of the fuma garb he has now.(ninja would have fuma garb)