I've studied classical guitar many years ago, but that's past, I want to point out some characteristics of my vocal teacher. His name is Guy De Kehrig, and he's had a wonderful career as a tenor in Europe and Argentina, now he is with the permanent staff at the Colon Theatre.
When he proposes a vocal exercise, he sings it for me first, then waits for me to start. If I, humorously ask him :"with THAT excellent quality ?", he replies: "NO ! MUCH BETTER !"
When something goes well, he can't hide out his enthusiasm: "GOOD ! THAT'S BEAUTIFUL! "
When something goes wrong, he may say : "A PITY! IT WAS SO NEAR ! LET'S TRY LATER" and make some comments on how HE failed many times and how he tried to correct his mistakes.
Indeed I agree with Banjo Bonnie and would consider this teacher as an excellent navigator. He makes you feel that YOU CAN.

Yours, Andrés Magré (another Rick's fan since got a CD from Peter T) :)