With experience you will find that the breathing becomes so light it practically stops for quite long periods. These are often ended with a sudden, strong, 'gasp' of air intake. If you are aligned, yes. The Transmission is coming mainly from the Buddhic level. It is stepped down for us by the Masters and we step it down further.
Alignment is necessary to transmit it.
There is a danger inherent in all meditation, of course. These are very powerful forces. The forces which you receive from your soul during meditation are very powerful, especially if you meditate in a dynamic fashion. Transmission Meditation is a very dynamic meditation, although it is also the simplest one I know. But it is totally under the control of the Masters.