When should I practice positive affirmations?

"Repetitio mater studiorum" - repeat the affirmations every day!

The best times to practice are first thing in the morning and last thing at night (or whenever you feel that you need to repeat them to start feeling better).

During these times, your mind is more open and will absorb the statements on a deeper level. 

It is best if you say them out loud while looking in the mirror.