[jph00]

Just jump in with this course. Your background in web dev will be really helpful, but there will be plenty of new concepts to learn - don't try to understand everything perfectly the first time through, but just try to complete each week's assignments as best as you can. You'll need to learn python and numpy along the way, but there's plenty of free online resources you can refer to when you see something you don't understand. And use http://forums.fast.ai of course.

You can then go back through them a 2nd time and do a deeper dive. By that time, our Intro to Machine Learning course will be out too :)