I've begun my own self-study/self-teaching of mathematics (here, in middle age). It's astounding how much can be forgotten in 20+ years, proving that math is one of those use-it-or-lose-it skills. Seriously, I've had to back all the way up to fractions. However, today, there are numerous resources that make learning on your own easier. I read reviews of textbooks (way too many) and study aids (and don't forget a workbook or two for practice-practice-practice), made wise decisions in which of those tools to arm myself with and am currently off and running. I have all I need to get through differential equations. My arsenal also includes the boon of DVD instruction. Of these, I might suggest the A+ Tutor DVDs (such as The Calculus I Tutor - search Amazon for any of them) and/or The Great Courses series (they have some awesome instructors on their DVDs - these are college profs, usually good ones). Being slightly dyslexic with a touch of ADD, I find it far easier to learn on my own than ever I did in a classroom - no time table, no pressure beyond my own discipline. And I love the DVDs - no college profs ever came with rewind buttons, and I can wear those puppies out, over and over, until it either clicks or finally sinks into my 46 y.o. brain. I say go for it - be resourceful in gathering your resources and don't forget to discipline yourself to actually sit down and do it. Give yourself goals and stick to your plan. You'll get there. Meanwhile, I plan on staving off the old-timer's disease (Alzheimer's) as loooooong as possible. Other people fancy retiring to make pottery and such. I plan on retiring and becoming a geologist - yeah, just for fun. Good luck, Kevin.