While you are training there is no way you could work part time, or have extended periods off.
But once you validate, there may well be an opportunity to go part time. If you can find someone who is willing to do the same, then you could job share.
However it should be remembered that if you have a near relative who is terminally ill (I sincerely hope this is not the case with you) I think NATS will grant paid leave for upto 6 months to enable you to nurse them..........but don't quote me on that. I'd have to look it up.