French Horn is just ...hmm... how to put this nicely... anti-all-element-of-fun-and-personal-enjoyment.
Yes, it's my principal too...Connie (my horn) I still love you, you're still beautiful I just don't like you sometimes....
Trombone too is weird 'til you get used to the whole moving your arm thing.
The rest aren't too partivularly hard to learn, though MASTERING anything isn't easy.