It's entirely possible to hold down a casual job and do a full-time course of study/flying.
I took a casual job out of necessity working Friday and Saturday nights, and most of Sunday. It paid enough to cover my living expenses and a beer fund (in addition to limiting the amount of time I could spend in the pub every weekend p#ssing money away).
Had no impact whatsoever on my study or flying, and just about kept my bank account on a life support machine.