Would like to use WD MyBook external SOLELY for my iPhoto library and remove it from my hard drive to clear up space. How do I do this?

I just bought a 3TB My Book that I would like to store my iPhoto library on and remove it from my hard drive completely. I am running Time Machine with another external drive as back up and would like to use Time Machine to also back up my photos that will be on my My Book external. How do I move my iPhoto library to my new external and delete it from my hard drive? The catch is that I only want this new external to be for my iPhoto. I don't want Time Machine to start backing up my entire hard drive, since I already have an external dedicated to back up. I have not attached my external yet because I am afraid it will automatically start backing up my entire hard drive. I am very experienced on a Mac but not very technical so please, no big words and THANKS MUCH in advance!!

First format the drive to OS X Extended (journaled) with ownership set to be ignored:
Next drag your iPhoto library from your Pictures folder to the EHD.  When the copying is complete launch iPhoto with the Option key held down and in the window that comes up select the library on the EHD:
Check the file path under the window to make sure the correct library has been selected.
Once you've confirmed that the EHD library is working properly and has all of your photos you can delete the library in your Pictures folder.
OT

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