I don't know if I really had tourettes or what was wrong with me, but for about a year around age 12 I developed a tick. I would make a high pitched noise, sort of like the girl in the video with the 'woo' but I would keep my mouth closed and basically "hmm" as high as possible. I didn't know why I was doing it, I just felt a strong compulsion to do it like needing to scratch an itch - sometimes I didn't even notice I was doing it unless other people mentioned it.
It started off very rarely and got worse and worse for awhile, and then happened less and less until it went away. I don't think I did anything specific that got rid of it. My mom took me to a psychologist or whatever once, I was also having trouble completing tests at school when I never had before; just couldn't focus. I don't remember what they said other than asking a bunch of questions and saying basically, 'well... let's see where it goes'; but then it ended up fixing itself more or less. Although after I started noticing it and getting embarrassed by it I would try harder and harder not to do it, I don't know if it was really just that easy for me to stop or what. I remember: trying to stop myself from doing it was like this rush of blood to my head, like the emotional equivalent of a boiling kettle whistling... like I was about to pop. But if I could recognize the urge and then distract myself then I could stop myself from doing it.
I can't speak for people with more severe tourettes.