Yes, the protective practices can be done without a teacher as they are universally beneficial.
In a retreat setting it is also excellent to do all 4 in one session.
If you’re practicing in busy laylife it is also ok to focus on each for a certain amount of time. For example one week or even one month for each. Whatever helps you memorise and get used to the 4 practices.
After you are confident and have memorised them, and have taken up a main meditation subject they can be used as a medicine.
That is before you do your main meditation you self diagnose which of the 5 hindrances (nivarana) are most effecting you that time and are likely to affect your meditation and use the appropriate protection:
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lust = Asubha
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anger = metta
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dullness = buddhanusati
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annoyance = maranasati
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doubt = all 4
Then after you have done bhavana, usually by reciting a verse and a mantra eg Itipi so and Buddho for however long needed, then the hindrance subsides and you can do the proper meditation easier.
The problem is the English word meditation is non-specific while Pali has many terms.
The standard method after giving (dana) and precepts (sila) are upheld is mental cultivation (bhavana) then concentration meditation (samathakammathan) and finally insight meditation (vipassanā Kammathan).
I believe this is true for Pa-Auk but I’m sure others can correct this if I’m wrong.
When Sila, Dana and Bhavana are established then we take up a meditation subject and commit ourselves to the Buddha and meditation teacher (end of Chapter 3 Visuddhimagga) we may study with them for a long time or just be given a subject to practice by ourselves. However it is, we should make a resolution to practice the specific practice for a set amount of time each day, however many months etc.
We shouldn’t abandon the practice either in the meditation session or after a month etc because we see something new or are bored or our leg aches a bit etc.
This is why the 4 protective practices (caturaraksa) are so important they train the mind like as in the simile of the animal tied to a stake and we can get the tools to deal with the 5 hindrances that interfere with meditation too.
As for books, I live in Thailand so haven’t needed to read any on this topic, but am sure others in this forum have suggestions.
