This is all good advice. I've also been working from home for a few years and would only add...
• it takes getting used to. The initial feeling is that you're somehow not part of everyday working life/society, there's no office banter (fine for me as I'm naturally a bit anti-social anyway!) but you WILL get used to it
• bear in mind that without distractions you'll almost certainly be more productive than in an office environment. At the start, it's tempting to overcompensate, but in time you'll appreciate it means you can take more time out to do housework, go out for a run in the middle of the day and generally take advantage of "off-peak life" (empty cinemas, never having to queue etc) and still get your work done
• definitely agree with getting dressed in the morning and being "work ready" within your nominal working hours. Sitting around in your Y-fronts (we've all done it!) makes it harder to engage
• stay on the phone/facetime with work colleagues - this will help with any feelings of isolation etc
I love working from home now and would really resent going back to the commute/9-5 way of operating. Once people have had a taste of this, it wouldn't surprise me if this becomes much more popular once we're through the other side of this whole thing. In the meantime, stay safe people!