Mindfulness, or awareness, does not mean that you should think and be conscious 'I am doing this' or 'I am doing that'. No. Just the contrary. The moment you think 'I am doing this', you become self-conscious, and then you do not live in the action, but you live in the idea 'I am', and consequently your work too is spoilt. You should forget yourself completely, and lose yourself in what you do.