Actually yes it is, if you have the will power. I used to have this OCD when i was a child that made me twitch my neck and face and i also used to make kind of a "hmph" sound with my throat. It started to annoy and me and to be so embarrassing that i decided to stop it. It took me a LOT of willpower and quite a big part of a year to make them stop, but i did it. I do still have very mild version of those even today after 25 years from when i stopped, but it's basically impossible to notice or hear them when you are around me.
So to the OP, you CAN stop it without any help, it certainly isn't easy, but you can do it if you put your mind to it