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Chemists/ pharmacies or whatever you call them where you are from will sell it in smallish bottles, it lasts a long time so a little bottle will be ample. Larger quantities can be bought on line...

I assume that you used a brush, and didn't just rub the soap on your face :).
A few pre shaves you could try are:
A bit of glycerin, just a little on your hand and rub it in,
Vitamin e based...