Practise parking behind one car only i.e. not between two cars. That way you do not need to be riding the clutch at all, just put it in reverse give it enough throttle to be moving backward and then concentrate just on manoeuvring the car.
I find that using the rear three quarter window as a sighting line helps, when you can see the end of the car you are parking behind in the rear three quarter start turning the wheel until you are pointed out at about 1 o'clock, the straighten the wheel and reverse straight back until your bonnet clears the end of the car in front, then full lock on to turn your car parallel to the curb. It does not matter if you finish up 5 feet or 15 feet from the car in front as long as you finish within 6 inches of the curb. Once you have practised that manoeuvre enough times to be confident of finishing within 5 feet of the car in front and 6 inches from the curb, then start to practise between parked cars, slowly choosing smaller and smaller gaps.