If you are one of the following jobs;
Puppetmaster
Dragoon
Beastmaster
Dark Knight
Paladin
Scholar
Red Mage
Ranger
Summoner
You will be laughed at and called "a dead job." While as if you are one of the following jobs;
Warrior
Monk
Thief
White Mage
Black Mage
Bard
Samurai
Ninja
Blue Mage
Corsair
Dancer
The first mistake you make, regardless of how small it is, will cause all around you to accuse you of burning the job to be bandwagon and that you have no clue how to play it despite your playtime.