I think you need to take the classes when they fit into your schedule so you can enjoy them with less stress and still have time to go home and practice what you learn. I find that when I take a class I need some alone time to reinforce what I've learned and write things down in my own words. That way too you'll know what additional questions you might have. If you are trying to fit the classes into a busy schedule now when you know you will have more time later I would wait.