It is always good to start at the beggining and to work from there. Mindfulness is an incredible way of becoming alive and dynamic and putting all your worries, fears and anxieties into a box and just leave them outside of the door. Yes they may be real, but most times they are not. Mindfulness teaches you, intuitively  how to be free from your pain bodies and shackles of the traumatic past an the feared future. With out denial or anger od resentment, but just by letting them be and focusing your attention into the now into this moment.
For more talks and practices please go to https://www.youtube.com/channel/UCecl2nm11ZKhsLn0NwEQAUg
and check out the mindfulness channel.
stay safe
Huw