Gosh, I wish you lived closer. This is going to take longer to try to explain in writing than too just have you come over and show you.
First, about the mirror, there is a snap on connection on the front there where the mirror housing comes to a point, and there is a snap on connection on the lower rear. The top connection is simply a slip on. So, if you have both the front and lower rear connections unsnapped - or maybe more correctly unslapped - then just lift the whole thing straight up. When you slap the mirror up from the lower front, typically both front and lower rear connections release. At that point, just lift up. I see as I write this that Jay found a video. Good Job.
Ok - about the panels for the oil change - on or about the same time as BRP changed the design of the HCM oil filter, they changed the design of the panels such that you don't need to remove all of the panels that the manual says to. If that mod has been done to your machine, you can forget the mirrors. You just need to remove that wing shaped water reflector in front of the left foot peg, loosen the upper front and lower front torx screws on the metal foot peg support piece that secures that black kick panel, remove the other plastic rivets and hardware securing that kick panel that was behind the water deflector, and slide the kick panel down and forward to remove it. Yeah, they all have their own personality and work a little different. And if it is still there, remove the splash panel from underneath.
If you have an SE5, one way to tell if the filter mod, and thus the panel mod, was done, is to see if you have stickers placarded on your oil tank telling you to use the new sized HCM filter. Another way is to get down on the floor and look underneath at how the front two upper and lower torx screws secure the kick panel. If they are just two fittings that simply squeeze it tight without holes, then you're good to go and have the new panel mod and hardware.
One last thing - if you do remove all side panels for whatever reason in the future, be sure to follow the instructions in your owners manual. You do NOT want to remove those two silver cosmetic looking torx screws that are visible on the side panel. That panel pulls out from two rubber grommets underneath. Once you get it removed, you'll understand.