Closed Traffic

Today I practiced landings. I did five landings total, one of which with no flaps. My biggest problem so far is flaring too early. In doing so, I get excessive sink rates, which will cause me to touch down harder than usual. Sometimes I balloon, which is when instead of coming down to touchdown, the plane starts going up instead. Often times for the touchdown, I don't pull back hard enough, and I land on all three wheels at once instead of just the back two. Here is a video of my instructor demonstrating an ideal landing for me: