I have yet to read how to fly an add on. I just hop in and look for appropriate switches, get it running and get the annunciator board, if any, clear-ish. Within a 'class' of planes they all have similar basic systems (non-avionic) that one can work through to start up. I tend to figure out autopilots on the fly...and keep gauges in the green on the way...and it often works out fine. Since I don't fly IFR...my learning curve on a new airplane is fairly short. I am def going to.pick up that Merlin when I get home. I am enjoying a couple in that class now...Flysimware Cessna 402 (Great model..