Are there any special requirements for the place, the time or the orientation?
One should choose a quiet place with sufficient fresh air for practising, and ideally practise in the morning, at midday or in the evening. It is favourable to look south or north.
For beginners it is not jet so important to meet those requirements exactly. They can choose the place and the orientation flexibly according to the present circumstances. Beginners as well as advanced practitioners should always avoid wind that comes from front.