No matter how good you are (as a coach), or how much your client is capable in his or her field, make sure you are not assuming anything (or to start many important things).
Always ask yourself (as a coach) what you are referring to is a fact or an assumption. If you don’t have a definite Yes to your question, then the easiest thing to do is to ask your client, do not assume!
Assumptions are the trojan horses of a coaching conversation!