You should place your feet slightly apart and with one foot slightly in front of the other for better balance and of course don't forget to have your wand raised and ready.

Those words got stuck in his mind, making him nod as the professor demonstrated the position that must be taken. Looking around, he walked towards a corner and started to practice. Feet apart, one shall be slightly to the front, wand raised and ready. It still didn't look good, so he just tried and tried a few times to just fit it fine.

Let's hope he doesn't get his back kicked that day...