i teach 10-12 year olds to do this literally for a living.
rule number one..
do
not learn it via the music. learn it separately.
put on a metronome (google has a free one that works just fine) around 80. litter faster or slower is fine.
first just play (or clap, honestly) one note with the metronome. right on it. feel those quarter notes! the actual note you play does not matter. open note, fretted note, don't matter.
then double your speed. two notes per click. do this a bunch till it feels good and natural. this can take anywhere from 30 seconds to 2 years to get good at (speaking from personal experience as a music educator

) - but seriously, let this soak in.
then verbalize the counting. we count "one and two and three and four and." you are most likely to miss the "and" following the number four.
now you can try and combinations depending on how you are doing. i'd play this example at this point if i were you:
1 &
2 & 3
& 4 &
having a note on one and two is a great scaffolding to get you to nail that "and of three" (the up beat after 3.)
then i'd try something like
1 & 2
& 3
& 4 &
you'd be wise to do many variations, as many as you can think of. have fun with it. this does not need to be stressful.
then try
1 & 2 & 3
& 4 &
and finally :
1 & 2 & 3
& 4 &
then apply the notes of the music.
you've now not just learned the intro to this song, but a whole lot of valuable skills that will apply to any and all music making in your life.
this is a rough sketch of how i'd teach this. i suspect most students will do perhaps a dozen variations before i'd get to one that's very close to the final goal.