I did all three of my degree programs while working full-time. It definitely can be done. There are advantages to working full-time while in school: your dependence on student loans may be reduced, leaving you with less debt, for one. Also, if your degree program is definitely related to your work, you can use your job as a subject for your school work, and use your school work to benefit your workplace. I did countless analyses of my workplace while working on my degrees, and was able to use my conclusions to improve the workplace.
My advice is to enroll for slightly less than full-time . It will take you a little longer but you stand a better chance of making good grades. Also, many degree programs are now partially or entirely online. People think these will be easy, but they actually require enormous self-motivation and self-discipline.
If you are motivated, you can do it! Don't let the need to make a living get in the way of following your dreams!