Sorry if this answer doesn't help you... but it's called practice.
You'll just learn when it is the right time to flare, and when the aircraft will kiss mother earth.
There are a lot of technics, some say to look at the end of the runway, others at the edge (specially if in the aircraft you use might have quite a high nose attitude... and you are small). After a lot of practice you'll get it, and it will make transitioning to another small aircraft quite easy.