I plan to increase the size of my separate home partition. I have shrunk
the size of the Ubuntu partition, leaving significant unallocated space
to it's right (higher cylinder addresses). Now I want to increase the
size of my separate home partition to include that available space (to
its left at lower cylinder addresses).

I recall that when I set up the separate home partition, I had to tell
Ubuntu where the home partition was by editing a UUID entry in
/etc/fstab. The value used was derived by using the blkid command. I'm
guessing that the value will change when I shift the lower end of my
home partition to the left and include the currently unallocated space
in it. I am also guessing I would use the blkid command again and take
the resulting value to change the UUID once the home partition is made
larger.

Am I on the right track here or am I missing something?

Oh yes, obviously I will back up my home partition first.