At times when I'm typing, I'll hit a letter key twice, putting a double letter where one doesn't belong. Then move the cursor and debate which letter to remove?
Doesn't really matter, as long as you actually do proof-reading. But 'way too many people simply type and send, regardless of what came out of their keyboard.
I often just backspace through some good to get the bad. Then just type back through. It’s usually faster than trying to get the mouse in the perfect spot, deleting what’s wrong, and putting the mouse back where it belongs.