This answer sounds flippant, but it is not: Practice. A lot of clever people have worked very hard for a long time. At the end of the day, though, colliders g

This answer sounds flippant, but it is not: Practice. A lot of clever people have worked very hard for a long time. At the end of the day, though, colliders get two beams as focused as they can in space and time, point them at each other, and hope for the best. Then they look at the results, make an adjustment, and try again.