Hello, I see you have a teardown guide for the d5100. My question is do I need to tear the whole thing down or just use...

I was doing a shoot about 5 months ago at a motor-cross raceway, and after about 200 or so shots, I finally got a chance to start reviewing some of my shots - I wanted to make sure of focusing, and to my horror, picture after picture after picture was completely black. The first thing I checked of course was my settings, and they were all fine. I don't know if you have ever felt anything like that but I was absolutely sick to my stomach LOL.. Well, I said all that to say this... I actually ran to my car, sat down and paused a few seconds, I then looked down at my camera, and suddenly thought for a second to take the lens off - so I did, and after removing the lense, I noticed that the mirror was up, and the shutter was closed - the shutter was stuck closed. I tried everything to un-stick it, except stick something inside the camera body, and I WAS NOT about to do that, so what I decided to do was to simply turn off the camera, and pull the battery hoping that it might do a reset on the mirror, and you know...