Hope everyone is well.
My question comes from two angles and a wish for some clarification if possible please. The first comes from reading Daniel's work and the second from my experience at a retreat in Thailand (which follows the Mahasi technique, albeit slightly adapted).
Reading through Daniel's work it seems implicit that before one engages in the practise of insight meditation, one should have at least gained access concentration.
"Until you gain access concentration, you ain't got squat. Thus, pick an object, practice well and often, attain access concentration ..." (MCTB, pg. 15)
"Having gained ... enough concentration to steady the mind, turn your attention to the bare truth of the sensation of this moment. This is called insight meditation ..." (MCTB, pg.19)
Whilst on retreat in Thaialnd at the initial interview I was asked if I had any previous meditation experience. I mentioned that I have a regular practice of concentration meditation. Much of what I've learnt in terms of Shamatha practice has come from listening to and reading the works of Trungpa and incorporating them into a daily practice. I was quickly informed that there method was not that of concentration practises, as it is "repressive" in nature. I was fully aware beforehand that there emphasis was solely on vipassana. It was mentioned that concentration was built up during the mindful prostration and walking meditations, and therefore all one needed to practise was Vipassana.
So my question really centres around the above:
1) is it necessary to have a separate concentration practise before engaging in insight meditation.
2) is it common that some teachers combine these two into one practice?
3) and lastly, when one does achieve access concentration and proceed to insight meditation, would one still balance the two, say for example practising concentration in the morning and insight in the evening?