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.
Doing trading along with some permanent kind of job is quite a difficult thing but there is nothing in this possible which you cannot do.
If you can manage your time in a way that you can do both the things simultaneously, then this is going to be the best thing which you can do for having a good amount of earning. It will help in living a very comfortable life and you will be able to earn a very huge amount of money.
This is right if you do able to handle or allocate your time correctly then it would really be an advantage for you to make more money together with you job and bitcoin as a sideline.It would really be difficult if the nature of your work is very busy no matter how you do strive on handling your time it would not be possible.Some people do already quit their job and go full time with bitcoin.