Practice, practice. And look well ahead, as previous poster said.
In the training glider, I recommend beginning the flare at the height of the average elephant, or the view from the top front seat in a London bus.
And then gently and progressively moving the stick back, wait, back, wait,
wait, wait, until it settles like a gentle leaf upon the greensward.
Do not try this with a 747 captain in the front seat: prior demonstrations are required.