How do you play Hot Cross Buns On Trombone?

Here is a simplified version of "Hot Cross Buns" as it would be fingered on the trombone:

Lower Register:

1. First position (no valve)

2. First position and push slide out only a bit (like Eb)

3. First position (no valve)

4. First position and push slide out slightly (Eb)

Middle Register:

5. Third position (trigger pulled)

6. Third position and slide out about halfway

7. Third position (trigger pulled)

8. Slide pulled all the way out (F)

9. Third position (trigger pulled)

Repeat these nine steps for the second half of the song.