Bo, one more tip.. sorry i forgot this one and it came back to me…

usually picc parts are written in the staff.. so play through the music on Bb as written. the fingerings are the same but on picc will sound an octave higher.. then switch to picc maybe play 2 measuers at a time then 4 etc to get used to it.. maybe you already do this maybe not…
also if you have to play something in D trumpet, it’s better to play picc in A because the transposition is in an easier key than picc in Bb. plus the notes on the horn are usually more in tune.. F major is your friend… hope that helps if you didnt already know these things.. if you did.. ah well..
be well.
mjn