You'll be fiiinnneee... I had to get one done a few months ago to test for some random stuff and then Ive been TWICE in the last week because they fucked it up the first time
Honestly getting vaccinated is so much easier the needle isn't even that bad for a blood test
The trade off is that it's gotta sit in ur arm while they swap in extra vials or whatever it is they do

(gee, imagine if someone forgot to take enough vials, that would really suck! You'd have to come back a second time, jee willikers!)