Keep trying, this is one of those things where the penny finally drops and you just start getting it right.
Two tips though. Firstly, get you instuctor to fly and approach and landing and PAY ATTENTION to the visual cues. No one here can tell you what to look for, its different for everyone.
Secondly, try getting you instructor to let you make longer approaches so you get used to getting the aircraft trimmed. By 500ft, you should be trimmed and almost able to let the plane continue with minor adustments till the flare.
Finally, if you are not coping with a slow aircraft, go up to 5000ft with your instructor and fly around at 65/70kt till you get the feel for it.
Have fun.
RTC