Be on time for your appointments & consultations. Punctuality conveys professionalism, respect and allows you to address & manage possible resistance on the part of the client.
A blog focussing upon cognitive behavioural & psychodynamic techniques & issues "in the room" rather than case or theoretical discussions.
Treat others as you'd like to be treated is a universal principle. Therapists who avoid working with other faiths and cultures can be assured that there is common ground to work from.
Set clear limits on diary-keeping and other journals. By asking for the minimum amount of information necessary, you increase the chances of obtaining reliable data.
Sooner or later, one of your clients will die. Waiting until it occurs to consider how this might affect you would be unwise.
Apparently innocuous comments can upset your clients. You can't avoid triggering issues unknown to you, but you can be ready to respond if they are brought to light.