Honestly, tmux is not hard to use. It has some contorted key bindings, sure, but its benefits are so immediately huge that the motivation to learn its quirks is huge too. And, unlike say, vim, it only has 3 things you really need to know: panes, windows, detach. Most people who use tmux, even casually, will inevitably be using it 'properly', within a week, and fluidly within a month. So this blog post is quite redundant.