When I learnt I would always be too fast because I was worried about getting too close to the stall. This was soon fixed by flying from Derby with runways which were about 340 metres long
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I agree with the previous posters - get the airspeed right by trimming then sort the decent rate out using small power adjustments. As mentioned previously, get the airspeed right, but don't fixate on it - the things which are going to kill you are outside the aeroplane so that's where you should be looking as much as possible. If it's not going too well, don't be afraid to do a go-round and try again. Good pilots do go-rounds, poor ones carry on and hope it all turns out OK.
Also, don't be too harsh on yourself - approaches and landings always look better from outside. I've had some absolute shockers only to be told when I walked into the clubhouse 'Oooh, nice landing!'
