4WD doughnuts are possibly the most spectacular to watch, but good luck doing it with a 2.5rs. Even a WRX has trouble breacking traction and getting going. It really is the realm of Group A and WRC rally cars with thier huge flat torque curves, and skinny gravel tyres.
There is a fair degree of skill involved, and even the masters often get it wrong, you need a rolling start, and some very violent wheel, and pedal action to get the car spinning, but once it has all 4 tyres going it shouldn't be to hard to hold it. (this from an interview with NZer Possum Bourne, on how to do Doughnuts in his WRC imprezza.
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For your underpowered little car, you may get away with running on 4 space saver tyres, most wreackers are happy to give them away, other wise find a nice open patch of wet grass.
But a word of warning, its a very good way to blow at least of the diffs.