Running OCLP on External SSD. Help!

So I have a Late 2013, 27-inch iMac and want to install OCLP on it. I want to boot from a portable external SSD instead of the internal HDD. Is the process the same as if I was booting from a USB thumb drive? Do I have to do anything to the internal HDD even though I don't plan on booting from it?

I've watched a few videos online, but it just brings up more questions. Could someone walk me through the process?

submitted by /u/oriolorrick
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