@lafeeverte , you’re getting too far ahead of yourself.
When you get round to taking your practical test, you should be competent and confident. And, I am sure you wouldn’t put your kids in danger if you felt anything less than 100% able.
If you’re concerned about the mirror problem and steering issue, you may want to go and have an eye test. Just to eliminate your eyesight as a cause for concern.
You also need to feel at ease with your driving instructor. If not, find another one!