Is this spider mites, or what?

[SkyClan Cat]

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I tried swabbing the areas with alcohol, and got this

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(That one was from the segments in the second picture; the first one wasn't nearly as bad.)

The second picture looks like whatever took over and nearly killed this same plant a couple years ago. I have removed that particular branch already.

I'm going to have to bring it into the house soon due to the weather, and I already have no idea where to put it, especially if I wind up having to isolate it.

[HairyHarry]

Hmm, with spider smites this severe I would expect more/some webbing.

[Steve Johnson]

Hmm, with spider smites this severe I would expect more/some webbing.

Depends on the type of pest mite we're dealing with. Red spider mites do spin tiny webs, although I don't see anything like that in SCC's photos. (Besides, you can see their reddish-colored bodies with the unaided eye.) Flat mites don't spin webs, and while they can't be seen without magnification, the damage they leave behind isn't consistent with what we see in the photos either. The problem could be mealies, although I'm not confident enough with that diagnosis to say for sure.

[hegar]

Another small insect that causes a stippling of leaves and succulent green stems would be thrips. These have elongated bodies. You can also examine your plant very closely for scale insects. Most of those tiny pests occurring on cacti are either dirty white in color or brown.
Did you check the "Pests and Disease" section of this site? A lot of the possible cactus pests are covered there.

Harald