I did the (CAA) IR part time. Based on my experience, part time works OK, but you really need to concentrate on the training and put anything else out of your mind. You need to leave all your business/domestic/girl & boy friend issues at home. Otherwise you end up wasting very expensive hours.
I also found two training sessions in one day was the max that I could handle. One some days I tried one early sim session and two flying sessions, but this proved too much and the last session was largely a waste of time. Having time to think about the issues of each session afterwards and really learn the lessons will pay didvidends in speed of progress and cost.
However, I'm not superman. You may be.
AA.