I don't know much about dancing (even though I can bust a move!) but doesn't matter what you decide, be ready to put in hard work. A lot.
On average it takes someone to master something about 10,000 hrs which is about 10yrs.
I want to share this with you though, I just recently read an article about the difference between what do you want to do in life and who do you want to be in life.
Given the assumption that in order to succeed you have to put in a lot of work, the difference between achieving the success or failing, it's based on your working attitude.
Based on how we - humans - are "wired", we are very inclined to say things like "I'm going to dance" or "I'm going to play basketball" or "I'm going to train for a marathon".
The key to succeed is to envision yourself being a dancer, a basketball player or a runner. In this way when you are practicing those many hours everyday it will be hard work but you know you are building towards something.