You also have to realize that you got a yappy dog. They're sweethearts yes, but quiet, no. From dogbreedinfo.com:
"Sweet, gentle and loving, the Tibetan Terrier is lively, mild, and fun, but can be a bit willful. Reserved with strangers, but very dedicated to their owners, they are not happy when left alone. This breed does best with older, considerate children. This brave, intelligent, medium-sized dog likes to bark and is a particularly good watch dog. Its bark is deep like a rising siren. When the Tibetan Terrier is with other dogs it can try to dominate. In the United States, Tibetan Terriers' bloodlines vary in terms of height, coat, and personality. Check with the breeder about any particular litter's genealogy. The Tibetan Terrier has great agility as well as endurance.
In other words, you've got a dog that will never be quiet. And from what i've experienced at the shelter and clinic they can be snappy (any terrier for that matter) and uncooperative. Good luck, but remember what you're dealing with.