Glad to know that you're crunching through Calculus.
Even though you're here for the harder problems, it might be good if we chat from time to time. I'm actually interested in helping people understand how to solve the "standard" or "typical" kinds of problems that are encountered in first-year university mathematics. I've already done quite a bit of work in Linear Algebra, but I'll so be working on Calculus. So if you have any questions, please feel free to drop me a line, and I'll see if I can help.