I’m about to put a new hard drive and battery in my main laptop, a 2017 HP Envy 15. Whenever I make a change like this, I like to be ready with backups, Linux install images on USB drives and whatever tools and parts I might need. I’m not as worried about running into problems because I now have a very decent second computer — the 2011 27-inch iMac running Debian Buster — if the laptop isn’t ready right away, I’ll still be able to work.