Nollie flip is one of the most fun tricks in skating but felt unattainable for years until I found out the secret, now they're basically easier than kickflips on flat and feel totally like you can only dream they do before you get them down, so I'd really recommend putting in the effort. The key thing to know is it doesn't matter so much how good your flatground nollies are (of course if you can tweak flatground nollies then nollie flips should come easy), what matters is how good they are up curbs and down stuff or just basically how good you are at nose-based tricks in general including bonking off cracks (actually especially bonking off cracks) and possibly stuff like nosebonks and k bonks. You don't want to nollie and try and throw an awkward kick, what you want control over is that nudging of the nose ahead of you and the corresponding backwards weight transfer. How I set up is big toe on my front foot goes in the center of the nose at an angle and in a position where it feels ready to shoot it ahead on me as I jump towards the tail (keeping shoulders parallel). Back foot actually goes pretty far back (in my case I think literally on the bolts) where you feel like you can comfortably sit over it before you pop and not lose control. It doesn't matter where or at what angle as long as it feels lodged inside the concave and ready to react to the pop. A tip I usually give to people for switch/nollie flips is to pretend they only exist on a 2D axis and can only use a straight line going through the middle of the board from nose to tail to rest their toes on, since that's where the pressure points are and so where you should be putting them anyway. From that position on it's all in the jump. Again it feels kind of like a leaping sidestep in the direction of the tail and you don't kick out, you focus on flicking your ankle at the apex of the nollie which means if anything you extend your leg but never throw it. Hope everyone who still doesn't have them gets those down in 2023.