The C152 is lovely to land. It is pretty stable, and doesn't float too much.
Trim. All the time. Keep one hand on it most of the way down. Keep your airspeed at around 65 kt, and two stages of flap. You can worry about three stages, or flapless later.
Try and learn to fly by attitude, rather than airspeed. Learn how much ground will be above the cowling, and then occasionally glance down to make sure your speed is ok.
Once you're at the final stages of... well final... forget the trim and the airspeed, and keep your eyes out the front.
Are you taking off all the power before you flare? If so, try leaving a little on. 1200 rpm will be enough to help make the whole process a little smoother. Again, you can worry about doing it 'right' once you've got the hang of the flare.
Finally, how do you know when to flare? Keep pointing at the ground until you hear your instructor take a sharp intake of breath, and then pull back
