For those who aren't Vim users or fans (raising my hand), you can use the Nano editor (more user friendly IMO) to edit crontab (step 8) as follows:
export VISUAL=nano; crontab -e
If you've never used Nano before, use CTRL-O to save your changes and CTRL-X to exit Nano.
Edit: The above command is only good for one command use. If you want nano to be the default editor for an entire SSH session use the following, courtesy of sean:
EDITOR=nano crontab -e