Landings for me (as well as most others) is all about repeatition. So, like was said, lots of slower and moderately lower practice passes worked well for me. Flying the basic circuit and perhaps using the tops of some trees to gauge your height and speed and finding different places in either the downwind of final parts it (circuit).

One thing that someone told me which helped quite a bit, once you turn to final, bring the plane to you! Naturally, not over the pits, but after you make that final turn and now are starting to line up, aim for yourself initially. We all tend to push them away from us anyway, but I think you'll find that it will help in getting the plane closer to the center of the runway.