Welcome to the forum, Jason!
Don't let the audio shops scare you.
That wire is just fine for speaker wire. The only thing that I'd suggest is that you check out the site linked
here and look at the table pertaining to speaker wire gauge versus length. It's just a guideline, but it might be useful. For example, based on that site, if your wire lengths are 40 feet or under (per wire), then you could run just about any speaker that most people buy with 14-gauge wire and fall within the recommendation.