hey dude.. fs feebles are one of the harder grinds out there. I know different ppl have different ways of doing it but my way seems simple enough. Just approach the obstacle at a very slight angle and almost set up like ur gonna do a fs 50-50. When u get over the obstacle sorta turn like a backside 180 but do it just enough so ur front truck wont land on the obstacle and that your back truck will be on a slight angle. I find it harder to grind when i try and keep it straight. Once on oush ur front foot down to keep ur front truck below the rail but out all ur body towards the back to prevent you from falling forwards. I find with all smiths and feebles you can lean back as far as u want and still be fine but once u lean forward ur screwed. Only time u should let up on the back is when ur getting out, gotta try and land as level as possible. This trick took me forever to learn but once u learn how to get on the rail good the rest will come.