Yes, the aim of this style of sadhana is to repeat a practice in a ritual style so as to form a positive habit rather than an unconscious one.

No, this practice must be completed in a seated position, with the spine tall. Crown drawing upwards and tail bone downwards; so as to give optimal physiological positioning for breath to move and kundalini energy to travel.

Is sitting on the floor with crossed legs is new and you’re finding yourself fidgeting - try elevating the sit bones with a cushion, yoga brick, bolster, rolled up blanket.

If unable to sit cross legged; on a chair/stool with your feet either planted firmly on the earth or ankles crossed - ensure you’re not leaning back into the seat back.

If you can start your day with this practice then I would recommend that - however if it’s not an option then try and complete the practice around the same time every day.

It’s very normal, as you start shifting energy through breath work and kriya practices, for the body to respond in a myriad of ways including surges of emotion, dizziness, pins and needles, tingling sensations, visions, insights, feelings of leaving the body all together. Please note : these practices are safe and you are safe - stay focussed with the breath and try not to attach yourself to any thought, feeling or response the body and mind is having. Notice what you notice and keep practicing.