You need a lot of time for trading especially in the beginning phase because you have to study a lot. Maybe you can start with a training account and not directly with real invests. But I think its possible also to do it with a job e.g. in the morning / evening / weekend.
I agree with the first part that trading need time and it is not a simple short job, but on the other hand you should not compromise study or job only because of bitcoin trading. If you have less time, make your trading simple by using only one altcoin and little investment etc. Only expand your trading if you have or when you have gained enough knowledge on how to make profit from it.