confused about transposing from treble clef to bass clef

[chip]

I have a piece written for Eb Alto Sax and would like to transpose it to 
Bass Clef Trombone. I've read a bunch of posts in the archives and am 
now more confused than ever. It should be relatively easy, as the bass 
clef bone should be able to read the notes as written, but just change 
the key sig? Right? I think...
Please shed some light on this for me,
Thanks.
Chip