Been reading the free book on the site, as well as browsed the forum, but I am still a little bit unsure of hwo to go about with the countermeasurements.

1. On the stim test I do use them?
2. On probably lies even if I am not lying - do I use them?
3. On any relevant questions, lying or being truthful, I do not use them?
4. Does it matter which kind of breathing I do blocking/breath slowly/bite tounge etc. 

Also, is it safer to use CMs to stress yourself or calm yourself?
Dont worry, Im not taking it any time soon haha.

Thank you

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Yes. Note that one should provide the expected answer to probable-lie "control" questions. It doesn't matter whether the answer is truthful or not.

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Augmenting a reaction to a relevant question is likely to result in one's failing the polygraph.

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Any of the scoreable breathing reactions enumerated in Chapter 4 of The Lie Behind the Lie Detector (see p. 145 ff. of the 4th edition) are fine, and may be combined with mental countermeasures or tongue biting.

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It's difficult to prevent oneself from exhibiting a reaction to a question. On the other hand, it is trivially easy to produce a reaction to a question. The countermeasures documented in The Lie Behind the Lie Detector involve producing reactions to control questions. The only exception is the breathing channel, on which one can prevent reactions to relevant questions by maintaining one's baseline breathing pattern. See the subsection "What About the Relevant Questions?" at pp. 150-151 of the 4th edition.

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I do not understand what you are asking here.

One apply countermeasures upon clearly recognizing a "control" question for 5-15 seconds, and in any event, one should stop applying countermeasures before the asking of the next question. Reactions to "control" questions need to happen within about 5 seconds of their being asked in order to be scored.