Practice. When you go to a longer barrel, it will seem easy. With a snubbie, any problems with the gun or shooter are magnified. A pretty good shot with a 6" becomes a miss with a 2".
Back in the 50's there was some hustler who went around to the bullseye matches betting people he could out shoot them and their 6" target pistols, with a Colt Detective Special 2". To make it 'harder' for him he would shoot the Dick DOUBLE ACTION only. This guy won a ton of money. Most people don't know that short barrels can shoot just as well as a longer one. What makes snubs hard to shoot is the short sight radius, and small grips. Things like a rough trigger pull are magnified.
The hustler knew all this and selected a really accurate gun, made sure it was sighted to 50 yards, and tuned it to prefection. He then probably burned a ton of ammo in practice.