It is possible, for multiple semesters I have worked 32 hours or more with full-time credit hours. The repeating issue that I face is prioritizing time for studying while making time to rest. My advice is take it slow and only do one or two classes if you have never juggled work and school.
Yep...I worked full time and took 4-5 classes per semester (the classes were 8 week condensed courses, so I was really only taking 2/3 at a time). I also did an intensive 5 week chem class (with 2 labs/wk, 4 days a week for 4 hours per day) while working 40hr/wk (and had the worst flu of my life on top of it). It'll suck, but you'll get used to it and it'll be ok.