Swapping a library drive--did it on a PC, how on a Mac?

I've made the switch from PC to Mac and am very happy overall. However, there's one thing I used to be ablet to do on my PC that I can't on my Mac.
On my PC, my music drive was \\mynasdrive\music which I mapped to "M:". When I travelled, I could still use iTunes disconnected from the NAS by plugging in a USB hard drive with my music and overwriting the drive mapping to "M:".
This saved having to reimport 40,000+ songs, losing play counts, etc.
I can't figure out how to do the same thing on my new Mac. Thanks

Quick answer if you use iTunes' default preferences settings:  Copy the entire iTunes folder (and in doing so all its subfolders and files) intact to the other drive.  Open iTunes and immediately hold down the option (alt) key (shift on Windows) so you get a prompt to select a library, then guide it to the 'iTunes Library.itl' file in the moved iTunes folder.
If your library is split with you library files on the internal drive and media on the external, things get very messy very quickly.  There isn't any easy way to remap to another drive.  You will end up with lots of broken links.  There are ways that might work to fix this but I am not going to type them all in unless I know you need it.

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