Glad to see not a lot has changed with #ArchLinux in terms of needing a certain level of ability. Spun up my VM this morning with 437 updates available but of course pacman refused because mutter43 and mutter are in conflict. The fix for me was:
sudo pacman --remove --nosave --cascade mutter
sudo pacman -Syyu

Oh, and I had to:
sudo mv /usr/bin/WebKitWebDriver beacuse pacman moaned about that too!