this is my ranking of the five more common instruments (both brass and woodwind btw I have ranked these easiest to hardest to master by my opinion) 1: basson 2:horn in F 3:Trumpet 4:oboe 5:clarinet 6:tuba 7:flute 8:euphonium 9:saxophone 10:percussion 11:trombone
hardest:Bassoon
easiest:trombone (the infinite)