I still think learning with someone professional is a better idea than from your parents. Then the parents don't have to feel pressured to get the child through the test. It took me four tries, but I eventually made it through with a mixture of parental help in between lessons and instructor lessons.
I think parents can sometimes give the kids bad habits that do no good when the examiner comes to marking you on the test. Procedures and safety really should be learned by a professional institution.