Mandy,
You are realising the difference between teaching and coaching, as defined by John Whitmore. If you can grab a copy of his book, treasure it. It is about finding an explanation that is understandable by your client, and agreed goals. Just to make it more interesting, they are likely to be different for each one.
Worst?, best? example come across whilst attempting to train driving instructor? A colleague said they accepted all the credit for past clients who had passed the Driving Test but none for those who failed, as "I told them." Never even thought to check if they understood or appreciated the reason, just that they'd been told. As it is a life or death industry, was tempted to spell that tolled.
Good luck and be a good one.
Apologies for being serious.