Ian Johnson provides some good direction for those looking to get their feet wet with d3.js.
Look at that map. I find that a big thing about learning visualization for the web is to set the right expectations. People coming from R or with little programming experience often expect to reach Mount Bostock really fast, but in reality, very few people are up there (if anyone). It’s not a plug-and-play situation. The good news is that you can still accomplish a lot at sea level, and d3.js creator Mike Bostock visits the villages often.