So I've been trying to learn Chimes at midnight and I am having difficulty getting the really fast and sludgy sounding riff down. I've been playing it slow and gradually increasing the speed day by day, but i've been finding it kinda awkward to play with the hammer-ons for some reason. Are there any special techniques to play this? what helped you learn this song (If you did)

Thank you,

(Sorry if this is in the wrong section)