I've had a few and I don't find them to bad and I have a very low pain tolerance and hate doing stuff like that. I've always do it myself or had my mum do it (I'm 21 and still have her do it). The throat one is like a tickle in your throat and the nose one it like pressure as you have to put it until you feel pressure. It's uncomfortable but not painful. It makes you feel like you need to sneeze 😂. Nothing bad will happen from the test I could promise you that. Are you looking at getting one done?
Is it a school one? Is there anyone you can have there who you trust maybe your 3 people could be people you really trust? Don't worry about a noise. They'll of heard so many noises then people do Covid tests. I'm sorry if this isn't useful. I don't know know tics work exactly but maybe you could sing a song sometimes that works for some people I've seen on tiktok? I'm sorry and don't feel very useful 😂