Emptiness doesn’t exist by itself . When we see appearances as appearances , we see they are empty of independent- true existence . This is seeing emptiness. 

 Mindfulness is not something that is acquired right away; perseverance is needed. It is necessary to be mindful not only while resting in the state of meditative evenness, but that mindfulness needs to be kept in any circumstances. While eating, while walking, etc., it is important to be constantly alert and vigilant in watching the condition of the mind. 

Mindfulness on the body is the single path traversed by the sugatas. Adhere to this and guard it. When mindfulness degenerates, the entire Dharma will be destroyed. Nagarjuna.