"Pair programming" - don't do it alone, have a second person check every letter typed. Do explicit backups beforehand. And for non-DDL updates, do it inside a t

"Pair programming" - don't do it alone, have a second person check every letter typed. Do explicit backups beforehand. And for non-DDL updates, do it inside a transaction where you can verify the results (preferably by running multiple automated reports) before committing.