I've been flying sim for several years now, but I have finally decided to start using the checklists. Someone posted that flying by yourself, especially in larger jets, breeds bad habits and I'm having a heck of a time breaking some of my bad habits.My question is, as the Pilot Flying, when I start the Preflight Checklist and the FO says "Oxygen" and I reply "Tested, 100%", am I actually supposed to check the Oxygen ? And the same holds true for "Instrument Transfer Switches", "Window Heat", "Pressurization Mode Selector" etc, etc? Should I be finding these switches and turning them on or are they already turned on and I just have to verify ?I don't have a clue where most of these systems switches are located nor how to check them if I find them. Am I missing something or are these checklists supposed to be, for the most part, simulated checklists ? I do realize that there are a majority of checklists callouts that I do know what they are talking about, such as, "Setting Flight Instruments", "Parking Brake", "Engine Start Levers" etc.My gut feeling is that I have a lot of learning to do and I'm still using alot of those bad habits that I've learned over the years.Thanks and Merry Christmas !!!Lee

Hi Lee,Generally speaking, the checklists are not "read-and-do".So you'd perform the series of actions, then back up what you did with the checklist.Indeed, lots of learning if you're new to the stuff! Cheers,