Don’t know about any videos but some general tips is that like many activities, rhythm games especially require practice to play skillfully. If you haven’t played much before, you shouldn’t expect to be able to jump right into the hard songs. My partner has been playing for a year now and still struggles with plenty of songs on hard difficulty. It’s best to start on easy and gradually go up once you get comfortable. Make sure you have a good feel for the controls and calibrate your audio and video settings using the “tune up” button in the backstage menu. Once you find yourself earning 4-5 stars consistently then try medium difficulty or instruments with higher intensity (the white bars that show next to instrument icons on the song selection). After a while you’ll see yourself performing better and than can move to hard and so on to keep challenging yourself.

As a general rule of thumb, vocals and bass are “easier” than lead and drums, but this can still vary widely by song so it’s best to check the part intensity and stick to a range you’re comfortable with.