Greetings Tilt,
As for "remain focused on inconstancy in all fabrications", I would suggest one achieves this by remaining focused on inconstancy in all fabrications. As far a direction goes on what to do, I do not see any need for anything separate, assuming one knows already how the Buddha explains anicca and sankhara - there is no deficiency in the sutta instruction.
In terms of how successful one actually is in maintaining this perception at any particular point in time, I expect that depends on the strength of the seven factors of enlightenment.
1. Mindfulness (sati)
2. Investigation (dhamma vicaya)
3. Energy (viriya)
4. Joy or rapture (pīti)
5. Relaxation or tranquility (passaddhi)
6. State of total equilibrium of the detached intellect (samādhi)
7. Equanimity (upekkha)
And in keeping with the spirit of sharing relevant instruction from the Sutta Pitaka...
SN 46.16: Gilana Sutta
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The Blessed One said: "O Cunda, let the factors of enlightenment occur to your mind."
"These seven factors of enlightenment, bhante (Ven. Sir), are well expounded and are cultivated and fully developed by the Blessed One. They conduce to perfect understanding, to full realization and to Nibbana. What are the seven?
i. "Mindfulness, the factor of enlightenment, bhante, is well expounded by the Blessed One, and is cultivated and fully developed by the Blessed One. It conduces to perfect understanding, to full realization and to Nibbana.
ii. "Investigation of the Dhamma, the factor of enlightenment, bhante, is well expounded by the Blessed One and is cultivated and fully developed by the Blessed One. It conduces to perfect understanding, to full realization and to Nibbana.
iii. "Persevering effort, the factor of enlightenment, bhante, is well expounded by the Blessed One and is cultivated and fully developed by the Blessed One. It conduces to perfect understanding, to full realization and to Nibbana.
iv. "Rapture, the factor of enlightenment, bhante, is well expounded by the Blessed One and is cultivated and fully developed by the Blessed One. It conduces to perfect understanding, to full realization and to Nibbana.
v. "Calm, the factor of enlightenment, bhante, is well expounded by the Blessed One and is cultivated and fully developed by the Blessed One. It conduces to perfect understanding, to full realization and to Nibbana.
vi. "Concentration, the factor of enlightenment, bhante, is well expounded by the Blessed One and is cultivated and fully developed by the Blessed One. It conduces to perfect understanding, to full realization and to Nibbana.
vii. "Equanimity, the factor of enlightenment, bhante, is well expounded by the Blessed One, and is cultivated and fully developed by the Blessed One. It conduces to perfect understanding, to full realization and to Nibbana.
These seven factors of enlightenment, bhante, are well expounded and cultivated and fully developed by the Blessed One. They conduce to perfect understanding, to full realization and to Nibbana."
"Most assuredly Cunda, they are factors of enlightenment. Most assuredly, Cunda, they are factors of enlightenment."
Metta,
Retro.
"Whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable—if anything is excellent or praiseworthy—think about such things."