Trimble Curvature and refraction correction

So I'm trying to learn how to adjust traverse networks in TBC. I've been using Starnet for years, but I run all Trimble robotics, GPS, levels and field software, so I want to use the TBC advanced module I paid a sh*t ton of money for. This is a quote from the Trimble Access manual - "If you intend to perform a network adjustment in the Trimble Business Center software using data from a conventional survey, make sure that you enter a pressure, temperature and, curvature and refraction correction."

How bad is this going to Jack up my data? Most of my work is boundary/topo for subdivision design. All sites are small (<300 acres. Most are less than 100 acres).

I'm planning to run a network tomorrow that's about 3,000' East to West and about 2,000' North to South. I'm going to run it with the curvature and refraction correction applied and then I'll redo it without the correction. Can anyone educate me about what I'm about to do or point me in the direction of some literature to educate myself with?

Will TBC spit out some ground calculated coordinates or SPC after I adjust?

Thanks in advance for any information!