I'm going through the exact same thing. Luckily I have a 12 gallon that had just damsels for my son, which I'm breaking down for one QT and someone lent me a 10 gallon for the other couple fish. You may hear people say things like "try rally" or "kick-ich worked for me" but don't waste your money. For every one person that says a non-copper medication worked for them there are 3 that say it didn't (including myself). It's best to just do it right the first time.
I look at it this way, I didn't have a QT setup or a refractometer because the total cost I estimated to be about $100 that I can't freely spend. However, I have about $100 worth of fish, a couple of which I've had since starting the hobby, so I'd rather not loose them, then spend another $100 on fish only to find out that I need a QT. Best just to get it out of the way. Especially since I'd like to upgrade in the near future and might want to be safe and QT all the incoming fish for that setup too.