Also -the trick to flaring at the right time is to be looking in the right direction. Look at the far end of the runway, not the bit nearest to you.
If you have a flight sim at home to practice on it may help reduce the amount of airtime you need to get this nailed. I've used sims at many points of my training to get past sticking points. Sure, the 'feel' might not be there but if you do everything else as if it were for real (i.e. checks, radio calls, flaps, carb heat, mixture) and get good at it, then you'll find that the real thing will be easier as the practice will have given you spare mental capacity to use on the things that you aren't so good at.
Good luck. Your first solo will be the best thing that will ever happen to you in flying.