Joshua,
The ACPP is a full-time commitment. I have seen students (even at my own training center) enroll and try to do some sort of work on the side and ultimately come to me admitting and ask for advice. You will want to devote your fullest commitment to the program if you want to be successful.
There was this other thread I mentioned about how the difference between an Academy/University and ATP Flight School. I primarily focused on the amount of time for completion of programs. Could I still work while studying at ATP? - Student Experiences - Airline Pilot Life
As Tory mentioned you could do two things: 1) Save money as an emergency fund or source of living or 2) Factor into a loan for living expenses, ATP has a financial calculator online to help figure the amount of funds and our Finance department is great.
Brady