Here's a #TJT I personally use every time I learn music: Listen to the song and hand write the lyrics phrase by phrase. STOP LOOKING UP THE LYRICS ONLINE! Doing this cements the song in your brain. Once you've completed it, go back and do it again. If you want to double check the online lyrics or use them as a lyric sheet later, be my guest. But the initial time you look at the lyrics, they should be written by you.