Switching brass instruments?

Question

well right now i am playing sousaphone in marching band at my school and im planning on learning french horn for when concert band comes around. how hard would this change be?

Answer 1

You couldn't find a bigger change!  The mouthpiece is tiny, you have to play with your left hand, it is written in a different clef.   A much easier change would be to bass clef euph.  

The spacing of the notes is much much closer than tuba, you will find ways to miss notes you never thought of before.

Answer 2

Well, retardface, I'm sure you can handle it.