Hi Julie, and welcome to our forum.
To your question if TS is easy to be diagnosed, I can only say: It depends. It especially depends on the parents. If a child has caring, loving parents who will have concerns checked out (if they're concerned to begin with), then it is likely that a child will be diagnosed early and will get help and support.
On the other hand, as you can see by my signature, I got diagnosed at the age of 51. My mother would just admonish me to stop those 'terrible nervous habits'. What I got was ridicule, anger and abuse. I diagnosed myself eventually, and had that confirmed by a Tourette specialist.
I don't think I am such an isolated case, either.
Also, it depends on the severity of the tics, and how noticable they are. If most of your tics are things everybody does sometimes, then people don't necessarily notice (I fall under that category, I have over 40 tics, but none of them are terribly obvious most of the time). On the other hand, if somebody yells, swears, frantically waves their arms, pulls grimaces etc., then of course people will know something is wrong, and this person has likely been diagnosed long ago.
German citizen, married to a Canadian for 28 years, four daughters, one son, eight grandchildren (and one on the way).