Auto Focuser not plugged in or forgetting to reverse its direction on my refractor. Forgetting the battery - it was a nice little visual session. Plugging too much into one battery - mount kept failing as a result. Not disabling Windows updates. Not placing the filter wheel at an angle that won’t hit the mount before a Merdiain flip. Trying to plate solve stars that were behind trees. Screwing on the accessory tray too tight on my Heq5 meaning I could barely make Azimuth adjustments. Forgetting to collimate. Forgetting to focus... arghh... it’s a never ending list
