I have a 2012 wr450 supermoto. It has 1100 miles on it. Today while riding it blew the seal right at the bottom rear where the two case halves are mated together. The silicon was blown out and it dumped its entire oil contents. It looks like it happened a mile from where I stopped, and it was running and not making any abnormal noises when I stopped it. It looks like it dumped about half it's oil contents in the driveway, lost the rest while riding. I wasn't beating on it while any of this happened. I've done top ends on dirt bikes before but never split a case in half. How much of a project am I looking at here? Am I going to be in over my head and need to bring it to a shop, or is this something the average joe can do. I already have the shop manual and am reading up on what a project it looks to entail.