I drove 75 miles to see a lymphedema specialist who had been through the specific training for head and neck. Personally I would get the appointment with the one 75 miles away, take someone you trust with you that has a good memory, etc, as you go through the steps. You will practice and then come back & they will check to see if you are doing things the correct way.
Those two appointments will probably tell you most of what you need to know. They will want you to come back to see what your progress is, but really you can learn this in a couple of times and be checked two or three times and be in good shape.
At least this was my experience. They will probably have you purchase a compression "garment" for your head and neck, which you will wear for a while. I still do the massage at least once a week, but haven't worn the garment since going through the early training.

Most of them will work with you like that because you come from a distance. I am sure you can learn much of it from a video, but different physical or speech therapists will teach it differently, and it would be best if you had someone to check what you were doing. At least this is my opinion. The object is to move the lymphatic fluid from the face down the trunk. Things need to be done in a specific order, first preparing where the fluid needs to move and then moving it.

Best,
Anne