I used to work Ramp for a charter operation that had two Excel's. Systems were pretty basic in the real deal. Most of it was automated through the Primus systems. I used to know how to power one up from cold to systems running (other than engine start and FMS programming. Probably still could with a checklist and the real airplane) Modern, small to medium bizjets are actually pretty easy systems wise. Where I worked, we also had a a Citation Encore (Citation Bravo/II with similar avionics to the Excel and the same engines. Quite the hot rod) and 4 King air C-90B's that I could do everything but start the engines on. Our Challenger 601 was a different animal. Most I could do was get power on board from the GPU so I could turn on the cabin lights to clean it.