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.