2.4.2 header questions

[D Josiah Boothby]

Hello list,

The documentation pertaining to headers has been a bit confusing to me, so 
I'm taking my questions here:

With a multimovement piece, how do I get a large roman numeral centered 
between movements indicating which movement is beginning?

Similarly, how do I get a header indicating which instrument a part is for 
on each page?

And lastly, if I have a footnote, how do I do that? Should I be using 
lilypond-book?

Josiah