Search for tactical firearms training and you will find tactical training centers and federal law enforcement training programs, which teach in person. NES is something else: a structured program for private citizens that you run on your own, at your own range, with a printed plan and targets.
That makes it a complement to live instruction, not a replacement. If you have never drawn from a holster, learn it with a qualified instructor first. Many ranges restrict holster work and rapid fire, so ask yours before your first session and choose a bay that allows what the plan calls for.
And one line we never cross: this program teaches shooting skills. It is not legal advice, and it does not teach you when you may use force. Learn your state’s self-defense laws from a qualified attorney or your state’s official sources.
Still building the fundamentals? Start with the pistol training program. Carry every day? The concealed carry training program shows the whole 4-month path.