Shirshasana is stay on head.

Asanas of yoga as stay on head is importance, as here are two variants as Salabma Shirshasana as means a stay on head with support and Niralamba Shirshasana is without support, as beginners doing technique A, as not pass away from a pose,as after enter for time to time, try to do asana, as here is not right methods training, as doing asana for one time for one training.
A technique doing for A.
1.On begin stages is a good, that you having a helper, which support for your legs, and preventing falling out, as roll a blanket for four times, and put in corner,as he is touching for both walls, low on knees,as in Virasana as a face to corner.
2.Full for a cross fingers, lock theirs, big fingers touching to each other, palms forming a half circle cup, put a crossed palms in 6 cm from a corner, fingers are small and big are for each other parallel, if palms are finding on size as more,than for 7 cm from a corner, thus on an ending pose are having mistakes, as bending for spine vertebra, loosing a stretching position, belly shows to front, weight of body falls on elbows and in theirs having aches, eyes are straining and edema, red face.
3. As pre shoulders put on blanket, elbows are on one line, wrists are vertically, between an elbows sizes is a same for widen a shoulders, straight hands, not incline, if between elbows sizes are small, thus procedure having on side ribs, causing ache in breast, if size is big, thus breast does not widen, as pressure having on neck vertebra's.
In getting pose of palm, pre shoulders and size between elbows and breast forms a same triangle side, do not move elbows, and pre shoulders after,when they are put, rise buttocks, as elbow joints and shoulders are on one size having with each other, as head with palms, initial breathe.
4.On breathe out put a head top on blanket, as a back skull for will be a parallel fir wall, and on 2 cm in size from a small finger, stay such pose for and doing a few breathes in and out.
5.On breathe out rise knees, fingers legs are stay on floor, straight legs and move feet to insidely, body finding under straight corner to the floor, hard legs to do, stretch in knee cups to inside, stay in such pose a few Sec normal breathe.
6.As you helper stay from left, and support with hands your shins, and hips, breathe out and move buttocks to corner, spine not bending, as you helper raising your legs, and corpus, till legs are supporting in wall, keep corpus, supporting on a wall two corners, as weight supporting not on a helper hands, but on wall, as external heels edges are touching for both walls, as study asanas in cornets a good,that right head position and legs for beginners will give a straight wall corners.
7. As move buttocks from a wall, and transfer body weight on an all hands, head, and body. As often support for wall will teach for spine bending, as you are teaching without a support on an ending stage asana doing. Stay for minute in such pose, normal breathe, and doing a following as breast rise for a neck vertebra's are not squeezing, and on a head you are not feeling for body weight.
Side for ribs are rising up, widen breast, for a spine vertebra's are stay concave, waist vertebra's are straight, for peritoneum muscles are stretching and belly not bulging, as keep buttocks on a few size from a wall, and for neck and  waist are balancing, as let s heels for supporting in wall, as you are not balance loosing.
8.When you are getting control for pose, and will feel a sure, rise slowly for a time in asana for 5 minutes, normal breath.
9.On breathe out touch buttocks to wall, helper taking your shins, and hips, softer low and put theirs on floor, wait a few sec, raise head, refree hands.
In Shirshasana is importance not just for balancing, you are checking for itself, for an every sec changes in position of an own body, and teach for correct theirs, as falling on a teaching for stay on head, is not fear, if you cannot keeping, thus a weak for crossing fingers and relax and low softly, bending knees.
As a time for such asana finding as depending from possibilities and from a time, as from ten till 15 minutes as without a bad feels, as beginner keeping for two minutes, as rise till5 minutes, as do not allow for eyes filling a blood in rising legs, as on stay on head, if this happening, thus pose doing mistakes with, if head ache not having, spine, thus teach for technique B . ACHE DISPLAY.WHEN BREAST RAISING NOT RIGHT.