With all of my new knowledge, I now need to figure out how to create a project to house all of the PhyloWidget source code, and then run it and see what happens. Turns out that the "Project Configuration Tutorial" is next in the help docs I've been reading, so that should be a good start.
I still can't figure out how to run the standalone version, since I don't know what to do with the .sh or .bat files to make them, well, do something.
I've got a lot of reading to do about info visualization, too. Seems like people have been recommending good resources, so thanks for that. I just need to sit down and read them now.