Could I do it?

I've been wondering about beginning work on a Master's program. The longer I do what I do, the more I realize how much more I need to know. I enjoy studying and learning - just not sure of the work load and assignments to finish for this old brain and to do while I'm still employed full time. Anyhow, just thinking and checking with universities around North America. If you've got any advice for this old woman, I'm all ears!