Don't overthink everything. That doesn't mean that you throw caution to the wind and act recklessly but there is nothing wrong with exchanging common courtesies in a normal way. The "LBS" must proceed carefully but not become paranoid abut every little word or gesture.
Don't obssess over the sitch or your feelings. If you feel that you will fly off the handle with your W or act out of emotion, imagine that you are in a meeting with an important client or your boss. As much as you would love to, you cannot say what you want to or act the way you would like to. Exercise the same self control here.