Just do it

So far, you may have successfully cheated your way through. You can remember melodies well and your teacher has always played the pieces for you. Or you know where to play which note, but the exact names of the black things weren't that important to you.

FIVE COMPELLING ARGUMENTS IN FAVOR OF READING SHEET MUSIC

1. there are only 7 different note names - Hey, the alphabet has 26 letters!!!
2. with these 7 and some # and b you can play countless pieces. As you can see, the cost/benefit ratio is excellent.
3. graphic scores (without notes, only with symbols) are fun and can be
to great music, but the latest hit by Stärneföifi/Beyoncé you can
not replay the game.
4. if you can't remember what a piece sounds like at home, you don't have to
play old pieces all week.
5. making music and not knowing the notes is a bit like playing football and
don't know what a penalty kick is.

Klaus Kauker has published a handicraft sheet (PDF) for music cards on his website. You can download it here:

Link to Klaus Kauker's craft sheet

Cut out the cards along the lines and stick them on slightly thicker paper. Write the names of the notes on the back.

Place 5 randomly selected note cards on the music stand.
Say the name of the note AND play it on your instrument.
Do this at least 3 times a day

If you can do this more or less flawlessly: Increase the speed and
the number of note cards.