Everything you've been told is exactly right. To further expound a bit, if you can get your plane on line with the wings level over the end of the runway three feet high, the hardest part is done. The idea is to run out of airspeed and altitude at the same time. I've had good luck teaching landings by having the flier try to keep the plane FROM landing (not by adding power) but not letting it get any higher. Try to hold it at that three feet. As it starts to sink add a little elevator to try to hold that two or three feet of altitude. You'll find the plane will continue to lose speed and begin to slowly settle. As you continue to add up elevator, remembering NOT to let the plane get any higher... just enough to try to keep it from sinking, it will continue to slowly drop till the mains touch down. By then you ought to be out of flying speed and should have no trouble keeping it on the ground. The procedure is the same for a tail dragger or a trike gear. Now, that being said there's no substitute for PRACTICE! Every plane behaves a bit differently. A heavy, high wing loaded plane will have a lot faster ground speed when it touches down as opposed to a lightly loaded "floater". The principle is the same, but it looks a lot different. You just have to shoot landing after landing until you get the hang of how much elevator to use (it usually doesn't take much) to keep it from ballooning up while trying to hold that 2 feet or so of altitude. The idea is, if you touch down with appreciable flying speed it's hard to keep it on the ground. It will tend to balloon back up with any little bounce. On the other hand, if you run out of speed too high, you stall and maybe bend your airplane. Just try holding it off one or two feet from the runway as long as you can and see if that doesn't help your problem.