i do agree that if you aren't pretty passionate about the future career, it's not worth it to put yourself and your family through the tribulations of school.
i will say, though, that my first semester back to school (last January) was so much harder in many ways on my family (especially my then 20 month old) and me simply because it was a total change from the way life had been. DH had to pick up more responsibility at home, and the kids were upset about the disruption in what had been a very steady routine of life (i'd been a mostly SAHM for almost 7 years, since my oldest was born, except for teaching a few yoga classes a week when it worked well with our other scheduling committments). but not that i'm really into the clinical material and getting to work in actual clinics (i'm in PTA school so i'm in outpatient rehabs, nursing homes, hospitals) i'm totally loving it! it's a ton of studying and a surprising amount of stress, but we're all doing great now that we've had almost 2 semesters now to adjust.
so i guess all i'm saying is that pre-requisite/general education type of courses are always grueling and stressful. i had two anatomy classes last semester that i thought might truly be the death of me LOL but i feel like everything i'm learning now is so crucial to my success as a practitioner, and we get a lot of hands-on practice in the lab and in the clinic which makes all the book work a lot more tolerable, not to mention a lot more meaningful! so if you feel like you'd truly enjoy nursing, i'd stick it out. if you just picked it because you know it's a good paying job and jobs are plentiful and aren't really passionate about the job itself, school is not going to be fun at all and I'd get out now before you invest any additional time or money.
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