Actually, most plugins are easy. The problem is with plugins that need to interface with external programs--getting both Emacs and some program, like a browser,

Actually, most plugins are easy. The problem is with plugins that need to interface with external programs--getting both Emacs and some program, like a browser, to cooperate can be tricky. I don't think there can be a general tutorial for setting things like this up. The issues with this plugin are going to be due to your browser or JavaScript engine; the issues with a different plugin are going to be due to LaTeX or GHC or whatever program you're interfacing with. So the problems are probably going to be unique to each particular plugin rather than uniform across all plugins.