i am 20 days old in duolingo school .but i still have very confusion regarding the pronounciation.
It takes some time to get used to the new sounds. It's completely normal. Don't try to rush it but be ready to spend some time with it. Your ears will get used to the sounds with time. Try to pronounce the hanguls with a help from an audio quide (like the video Staffan linked). Practice all fields equally: listen, write and speak and your brain will start using and storing the new info efficiently.