You can't solo it. If you can't kill the bull as a tank, that's on you. It's definitely doable. But that's not the problem.

The problem is afterwards, he has a damage reduction buff that makes it impossible to finish him off. You need to hit him to make him drop, and then burst him down. If you fail to kill him then, you won't be able to drop him down again before enrage.

I've tried multiple times, with different jobs. The best I've gotten is 15%. Don't waste your time. Bring at least one other person. lol