I had a velvet outbreak a few weeks back. Had never done a QT and was very nervous about it all.
Others are right once you start doing it, you will succeed and will reflect 'why was i nervous about that?'. Whether that's doing FW dips for first time, or setting up an emergency setup.
Once you are done; make a checklist and ensure all critical equipment is in place, on and correct readings for all involved systems.
I don't know whether this is velvet or ich, but for me I lost 3 fish in 12 hours. I don't know if the fact you haven't seen such a massive die off, if that supports the case for ich or if I just got a particularly bad velvet outbreak. It was horrifying how quickly things devolved.
My build thread has some details, and I posted some threads about my QT strategy. It wasn't the normal recommended method, but it was what i could practically do (or atleast felt I could do at the time). The tanks were reconnected week before last, and so far no losses on inverts. Additionally all fish which started the QT period survived without issue.
Good luck. Unfortunately not taking action now due to 'being your first time', you will likely regret later. Had I been better prepared, got over my self-consciousness/nervousness to do the needful quicker I may of been able to save more of the fish. Only regret I have from my experience was not taking decisive actions sooner once the first fish showed symptoms.
