Private pilot here (who's also ridden in some full-scale airliner flight sims). A lot of the procedures in the video are going through checklists to test the various instruments and systems, both normal and emergency ones, as well as entering the route in the flight computer (used by the autopilot). This is what real pilots on real flights have to do.
If you just want to start the engines, taxi, and take off for a joyride (completely violating company/FAA policy), the steps are quite a bit less although still involved, depending on how old the aircraft is and the level of automation it has. This video seems to show a 737-800 or later, which is pretty new and most likely has a system that with one or two buttons handles the bleed air/ignition/fuel sequence of starting a turbine.
If you just want to start the engines, taxi, and take off for a joyride (completely violating company/FAA policy), the steps are quite a bit less although still involved, depending on how old the aircraft is and the level of automation it has. This video seems to show a 737-800 or later, which is pretty new and most likely has a system that with one or two buttons handles the bleed air/ignition/fuel sequence of starting a turbine.