I have yet to see a nose blunt on a down rail, it will probably be another ten years before one is even attempted haha. I wish I could over-crook or noseblunt. I might actually take the time to learn them. Any tips?
Be comfortable nose-manualing whatever ledge you learn them on, have smiths super dialed (helps with accuracy when hopping into the overcrook), and be ready to fall forward.
Learn them on a ledge with wide angle iron or one that slides well so that you have more room for error. I'll refer you to this post by Conor Davidson for more since it's the best how to I've seen on overcrooks:
"Definitely a ledge. Probably a short one, so anything under a foot tall will work. The coping should be square and as smooth as possible. The wider the coping, the safer it is as well. The reason being that if you go a little too sideways with not-very-wide coping, you're deck will be sliding on the wood WHICH DOESN'T WORK. You can also prevent this by controlling how "crooked" you get, but that takes some getting used to. Wax it down good as well, cause if you catch an edge on an overcrook you'll go over the bars and eat shit. Learn fs overcrooks first, they're easy and you can watch your deck lock into the coping. To learn them, go REALLY slow, or just stand on your scooter motionless next to the ledge and try just locking into the overcrook. Don't swing the deck of the scooter out too much, you'll end up doing noseblunts which a little more tricky. Keep hoping and locking into the grind, going a little bit faster each time. You'll realize that once you start going fast at the ledge, you'll have to lean farther forward than you may initially think. Otherwise, you're back wheel will immediately drop down into a smith. However, if you lean TOO forward, you'll end up sticking to the ledge and getting shot forward, so try to avoid that as well. Patience is key, no matter how much I do this trick, it is ALWAYS frustrating. Think of it like a nosemanual, but your wheel is constantly getting softer and harder and your balance point is constantly changing. That would throw off your nosemanual everytime and you'd essentially have to relearn them evertime you do it. An overcrook is similar in that way since all surfaces grind differently, and sometimes you'll be doing it on concrete, marble, coping, rails, etc. Thusly, overcrooks are pretty inconsistent and require a lot of patience. Holding them across an entire ledge is another battle, similar to holding a long nosemanual, but there are few tricks that feel as good and are as rewarding.
DO THEM."
I would also recommend watching people do them. Dylan Kasson, Hep Greg, Conor Davidson, and Matt Somers are probably the best at them. I saw BK do some and Elmer and some more people do them recently too. They're becoming more popular.
For noseblunts... I haven't figured them out yet. Ask Parrish, they're his shit.