My latest article for EnglishClub is on this, so also put together a links page on the topic (including reviews of books on teaching one to one too):

New article

Dealing with difficult questions from one to one students – LINK FIXED

Old articles, blog post and reviews

Teaching one to one articles, tips and reviews

Also have the outline of about five more articles on the topic, so if the demand is there might actually finish some of them…