@b0rk here's my tricks:

- use tab completion, if it doesn't tab complete (or if it does and it shouldn't because the file isn't supposed to exist yet) there's something wrong
- avoid using wildcards and relative paths, or use them as specific as possible
- test on backups first!
- avoid doing anything destructive at all, and use a GUI whenever possible, I don't want to discourage use of CLI but hey, if you can :)