Any of the major paint stores can match Pantone colors because they all can match any color with their tint machines.
Pick your paint brand. Glidden, Sherwin Williams, Behr, what ever...
Pick the finish: gloss, semi gloss flat, egg shell, washable ...
I like washable eggshell walls and semigloss trim. I assume you'll use Tennessee white
Call the store and take paint chips of what you believe is Volunteer orange. Give them the data below they prefer.
Take chips with to the paint store.
Tennessee Orange
CMYK 0 50 100 0
HEX FF8200
RGB 255 130 0
PMS 151
Tennessee White
CMYK 0 0 0 0
HEX FFFFFF
RGB 255 255 255
PMS N/A
Tennessee Smokey Gray
CMYK 0 0 0 80
HEX 58595B
RGB 88 89 91
PMS COOL GRAY 11
Get two of so of the rollers with the nap recommended for your texture. 1-1/2" quality trim brushes.
Buy the cut in painter to get even lines at ceiling and trim, it's worth it.
The primer you use will affect the outcome so use their recommendation.
1. Patch, spackle, and sand
2. Prime, spackle, and lightly sand.
Prime again if major color shade change, inspect surface and spackle and lightly sand as needed, reprime those spots.
3. Two coats paint with light sand as required between.
I bet they've all mixed it before.