Tuba and Trumpet passages

I've been told that these passages might be too difficult to play,

and I don't know any players of these instruments personally.

This one on the Trumpet:

These two on the Tuba:

Any help would be appreciated :)

What's the tempo? The trumpet passage is not really that hard unless it's blinding fast and the top tuba part would probably take some practice at a slower tempo, but not impossible. The bottom tuba part is uncommon, yes, but not undoable. For other orchestration reasons you might not want to write the two tuba parts like that.
Also, tuba isn't written as an octave transposed instrument like contrabass or tenor is. It's just written at pitch. No need for the double bass clef.

2 hours ago, Monarcheon said:

What's the tempo? The trumpet passage is not really that hard unless it's blinding fast and the top tuba part would probably take some practice at a slower tempo, but not impossible. The bottom tuba part is uncommon, yes, but not undoable. For other orchestration reasons you might not want to write the two tuba parts like that.
Also, tuba isn't written as an octave transposed instrument like contrabass or tenor is. It's just written at pitch. No need for the double bass clef.

 

Thanks for the comment :)

tempo:

What other orchestration reasons are you talking about?

Also, I put the double bass clef because I didn't want the notes to get very far off the staff.

There's the whole tuba part, if you don't mind taking a look at it.