Ok, so I got the Cobra Fatty crash bar on by myself & yeah they are a pain in the azz to do by yourself. I however found a trick of doing it by yourself.
1) bolt the two bottom mounts first while resting the top bar against the front brake lines(keeps bar from hitting the back of front fender).
2) next just simply lean bar forward to top of side frame rail & bolt the upper section of bar
3) put away your tools(all of them), down a cold one & you finished!