contrary to popular opinion and Hollywood most of these elite special forces teams don't succeed because they are aim-bot super soldiers. It mostly comes down to intel, preparation, and better gear
You'd actually be surprised about how good their accuracy is, and even more so their reaction time. Their weapons are almost always pointed in the right direction, and they just move faster than the normal Marines and Army infantry.
Their gear is better, but not all that much better than an average recon team. Their Intel is better, in that they are fully briefed on it, rather than the chopped down versions the regulars get.
The biggest difference is their training and lifestyle. They don't have to deal with the bullshit that regulars do, don't have to play stupid games. Their job is to be good at their job, so that is all they do. And because of all that training time, because they can focus without being pulled into a working party or parade duty.
Small teams are kept together at all times since very early in the training. Doing the same exercises many many times with the same exact people leads to mastery that makes them just seem faster and more fluid.
The lifestyle point is also true, its easier to keep your edge when there aren't constant mindless tasks to be done (gate duty) for many hours a day.
- I'm saying this from experience with armed forces, but can't claim its true for all elite units everywhere.
But it still takes someone with certain mental capabilities to do it well, aka the super soldier.