There will rarely, if ever, be someone else there in-person with me.
In which case you switch your Yeti to bi-directional and put the guest exactly on the other side of the Yeti from you. It may take a couple of passes to get the volumes right (there are no independent volume controls for each of you). Radio soap operas did it that way for years.
You can totally record the voice parts of the podcast and then slide the music in later.
“Let’s listen to Glenn Miller, ‘In The Mood.’” [cut here later] That was Glenn Miller, ‘In The Mood,’ recorded on a World War II troup ship in the North Atlantic."
You just bang, bang, bang through the dialog and cut it up and slide the music in later. You can do fades in post, too, and make it sound like a real radio program.
Similarly, If you have a sound file with a telephone conversation, you can integrate that later in post as well. You can even use a half-recording. You’ve heard more of those than you think. The host asks questions and then the guest answers. If you’re paying attention, they never talk at the same time. One was recorded two weeks before the other.
So if that’s the show, no Skype or other conferencing or communications, then yes, you don’t need anything more complicated than a computer, Audacity and a Yeti.
I want to stress there’s no internet connection during the live portion of the show. The instant you get into Skype and two-way conversations, it gets much more complex in a hurry.
Also a setup like that is aggressively non-expantable. You can’t get bigger just by adding another Yeti—or you can, but it’s not as versatile as you think. You can’t add three.
Under some conditions, Yeti microphones have noise problems. Frying Mosquitoes or “The Yeti Curse.” It sounds like this (listen when I stop talking):
There is no good solution. Buy from a reputable supplier and save your receipts.