Once collapsed, lay the wing on the hook shank, directly above the tie in point and take 3-4 tight wraps towards the eye, all while maintaining the death grip on the wing.
when you're happy its secure, let go with your hand and it should look like this.
see how the wing is tied just one thread wrap forward of the back wrap which tied down the hackle. sides or cheeks will hide this, otherwise, varnish will cover it up nicely if you use a bodkin apply it.
Take two more tight wraps once you're happy, and then cut the butts off close and at an angle. Then tie them down with 5-6 wraps.
If there's nothing else to go on, tie off and varnish, if there's sides, cheeks etc, get them on with minimum wraps ALWAYS going forward to the eye.