Personally, I worked and saved up for a couple years beforehand, took out student loans, and had a bit of help from family- all so I could focus on the post-bacc. But for a number of reasons that I won't detail here, found myself pretty broke recently. I got a work-study job at my college, which certainly doesn't pay top dollar, but does help ends meet and is designed to schedule around coursework. I also applied for food stamps and Medicaid after the savings ran out, which has helped immensely. I'm not livin' it by any means, but I get by.
From the way you've phrased it though, it sounds like you're continuing with a job you've already got (??). If that's the case,
this is the most recent thread on this topic, but there are more if you use the search function. Scheduling is key. An employer willing to be flexible is also key. Say you can get all your classes on MWF, but you still need to do FT at work. Will your employer let you do 13-14 hr shifts T,Th,Sa ? If yes, then with hard work and dedication (as well as scheduling
every moment of your time) you can probably do this. If no, then you have to change something. And class scheduling is typically non-negotiable.