I recently purchased my first shotgun, a Mossberg 500. I've watched numerous You Tube videos to get some ideas on cleaning, lubing, etc. Almost without exception, everyone seems to open and close the action with the barrel removed. The manual says,"never close the action or pull the trigger while the barrel is removed as damage could result to the firearm." It's difficult to clean and lube without opening and closing the action. Is this a big deal?