I have tried this!
one thing I can tell you though:
listen to the song a few times when the Korean parts come on, and listen for the beat in the pronounced word.
also, you can try to romanize the Korean lyrics to give you more of a hint on how to pronounce fast, strong, or soft words.
Take your time and try to spell it exactly the way it sounds.
if you need any help, you are free to message me when you need it.
I hope these helped, and if you in the end feel hopeless or lost, try to do it again some time to pump you up.
oh oh oh PS, try to post a video when you are done! I hope this isn't too much to ask, but please only post it if you are comfortable with what you sound like.
May I ask, is this for a k audition or something?
ugh, sorry to make this so long, but good luck!