As with all such things, it's a damn sight easier to do than it is to write down.
Has worked for many of my students who were struggling with their landings with previous instructors, but I didn't just read the above from a card.....
The main thing isn't to just guess the right place to flare, but to feel for it, hence pulling back 1/2 inch at a time.
Try the above method and (hopefully) you'll see what I'm getting at.