You're the same age I am, and last year I was in the same position you are in. I had to quit my job to do the training and pretty much gambled on passing. Some people are fortunate that they can take vacation or leave of absence for the month, but not me.
Fortunately I passed and I just finished my probation last Saturday. It was a leap of faith that paid off and I don't regret leaving my last job one bit. You have to make that choice yourself. Go to the info session and see what it's like. It's a shame they don't require people to do job shadow assignment anymore, because then you can actually witness an operator at work and what the job entails.
The training is tough at first. The first few days of driving is nerve wracking as with anything that is a new adventure. But you'll get it, it will click and you'll understand driving and turning the bus. Be on your instructors good side and listen to what he/she is saying, they are there to see you pass, they don't want to fail you.
Give me a PM and I can answer anymore questions you have.
I think they are still doing interviews on the same day as the session. At least that's how it was a month ago, but I'm not sure if they changed it or not