A simple aim of practice is to make you feel better! This comes around through tuning into the present feeling of skillful mindsets and using that to dispel negative ones.
Discernment (panna) distinguishes skillful from unskillful. For example - use it like a sensitive hand and it can detect and peel off layers of blockage - and restore enjoyment. This rest is samadhi.
Mindfulness can be sustained through a neutral act of observing visual, listening auditory or feeling in ones body. The latter is useful for emotions and psychological afflictions that cannot be opened.
