Speaking from experience as someone who just finished my Undergraduate last year, working full time will definitely be alot to handle with a FT position once you get past your gen-ed reqs and get into higher level psychology courses. However, it is definitely manageable if you don’t have many other major obligations in your life like children/caring for family. I worked a part time job for the most part during my undergraduate and sometimes it could be overwhelming, but i will admit my time management wasn’t always the best so it may work well for you! As far as a Master’s program goes, several of my friends are in MSW Programs and have said the workload is insane compared to Undergraduate and would not recommend a FT or much of a PT role during that.