@Lunamoon23 don't worry, they say it's not necessary to do it at all!
I was feeling disheartened yesterday because I got barely any but I kept trying for about 10 mins total, even with nothing coming out, and today I've had the most I've had so far! I guess it had the same effect as a cluster feeding baby 😂 have you tried persisting for several minutes even if you're not getting any, in case the same thing happens to you and you get more the following day?
I'd also say that the advice on it says to be relaxed which is difficult when you're getting frustrated. To combat this, when I tried for the first time the other day I told myself I wasn't going to collect whatever came out because I didn't want to put pressure on myself. Have you tried that? Doing it without prepping the syringe etc?
If that fails maybe you could ask your midwife to look at your technique if you're worried xx