I can be wrong, but I'm rarely inconsistent. I am not flip-flopping.
Unlike many here, I can remember when the Big Bang Theory was first published in the popular press. I was young, but already reading. I remember quite well my Dad's astonishment at how simple it seemed. I also remember very well when the CMB was discovered how it seemed that finally we had a cosmology that not only made predictions, but was confirmed by them.
I have kept track of the BBT's development since about 1958, and studied it in detail in the early 1970s. I was lucky to have a college physics professor who was actually an astrophysicist (his research area was cosmic rays and gamma rays) and I really enjoyed his classes on optics and the nature of light.
I think I have been entirely consistent throughout my time studying the BBT.
There are many bits and pieces that have kind of been grafted onto the BBT. Some of them, like the CP, seem to me a bit too neat (in the logical sense). One thing I mentioned that I'm not sure you took as important as I meant it be is that the CP holds only at cosmic scales. On local scales it is demonstrably false (just look around the room you're in at the moment). It is meant to be taken as valid only at cosmic scales. It is reasonably accurate at those scales.
However, it in no way invalidates the BBT tenet that spacetime was created at t=0 of the original expansion. Slice that however you want, but as far as we can tell it's a beginning. If there was a beginning, the universe is finite. Period. You can't have it any other way.
However, it's a specious argument, because (as I said) in a practical sense the universe can be considered to be infinite. So, it won't upset me (or the BBT) one whit if you treat it either way, as long as you're consistent and don't swap scales on us.
Now, as to:
Is there a difference between everywhere and infinity? The BBT states that the event happened everywhere. Is this everywhere limited?
this should not be confusing. If the BBT is correct, and at the initial instant spacetime was very small (either point-like or string-like), then the original expansion at t=0 created everywhere, and it did it at the same instant. For a very short period (on human timescales), everywhere was only in one place. As time went on, everywhere expanded greatly and now things that fill it are very spread out. Not infinite, since there was a beginning and very well may be an "edge" -- not that we can see it or get to it.
Nevertheless, it is not inconsistent to say that the BB created everywhere yet the universe is finite. It is logically inconsistent to say that the BB created everywhere yet the universe is infinite.
Therefore, this everywhere (the BBT everywhere) is limited: it had a beginning (beyond which you can't go further "backward." I also believe, though I can't prove it, that it has an end (or an edge if you'd rather call it that). It certainly is logical that if it were created by the initial expansion and is still expanding that there is some kind of "outward" boundary (wavefront, edge, whatever ...).