For your first set up yes I would set it up at least 2 days ahead of time, for just about any incubator-- the r-com being an exception, it's almost plug-n-go , but my old 1602 with turner and fan has been very reliable and it was free !
I set it up 48hrs ahead of time the first time and 24hrs the 2nd time. It has a tendency raise temp a little as the weeks go on and I have to tap it down but otherwise I've had no problems. It actually seems to hold humidity well. I ran it almost dry this last hatch and I've had it up to 85% humidity on accident before.