First, I do my tics when I'm not doing something physically (for example, while I'm watching TV, listening to music...). In the case of cracking my fingers, I can feel a sort of tension in my arms (which can be traduced by little trembling) and, to stop this tension, I've to crack my knuckles by pushing them under my chin (which is very ugly to see). If I don't do the tic, I cannot stop thinking about it.
For the throat tic, it's a little bit the same thing, I can feel "something" in my throat and I've to snore and clear my throat.
Something I don't understand about tics after reading some websites, it's the fact they are called semi-voluntary : what does it define. When I do my tics, I'm totally aware of it so it's voluntary