Lots of good advice already as far as I am concerned but to add to it get the
trim spot on. In my opinion it can be quite hard to get balls on perfect but my guess is your best landings are when you could technicaly fly your final aproach hands off. The height judgement comes down to experience but flaring from a well trimmed approach is easy, it's the inital stage is the hard bit.
But in any case a flat landing beats bouncing down the runway or floating to the point where the runway gets unnervingly short.
