In need of advice.

Dont expect to get that song down easily if youre just beginning. It has alot of bar chord sliding and you have to be somewhat left/right hand coordinated to tackle that song. Give it time and it'll come. You could potentially learn the "dah-dah...dah...dah-dah" melody and play it on one string, but if you want to play and sing that song, it's best to learn the rhythm chord progression and strum along.

The chord changes are really fast on that song. Learn to play from G to C by just moving the 2 fingers on the E and A strings while playing G down to the A and D strings while leaving the pinky and ring finger parked on the B and high E strings. You can also play the D7 by moving just the index finger to the G string and leaving the pinky and index parked. Em can be played by moving the index and middle fingers to the A and D strings the normal em formation while keeping the pinky and ring fingers parked. You can change chords really fast by doing it this way.

Here is the G chord.