I've always flunked at math; and knowing how intertwined programming is with math, I'm skeptical of my ability to learn how to code. Can someone be too dumb to learn programming? If it helps, I'm mostly interested in learning Common Lisp.
Is there a reason you want to start with lisp? If you're like, intellectually incapable of complex languages, the simple one I'm familiar with is python, which works great for a beginner who doesn't want to get into the nitty gritty of implementation. As long as you're not developing for a business or similar, I doubt you'll even notice there is an efficiency difference. IMO, the increased readability is tantamount to Python's usefulness to newbies.
THIS!! Start with something simple like Python. I don't think you need to be good at math to be a good programmer. If you understand the concepts of math theny you will be fine. I heard Rita Wilson say the other day something like "If you keep practising something you can only get better at it". (not a direct quote) Find a Problem then solve it. That is the best way to learn.