thanks for the replieS.its really helping .

Gheranda samhita seys, that people cannot open all chakras in one life.
Opening a one chakra takes for many years. So is recomended, doing peacefull Ajna chakra and next time do kontemplation for a one chakra
what powers - siddhis- do you want to get. For many years.  In Gheranda samhita is recomended opening chakra Anahata .So you may extend your life and next create immortal spiritual body for  correcting deficiencies reincarnation. See eastern Alchemy in book The secret of the  golden flower, by Richard Willhelm and Carl Gustav Jung.


See you Shiva samhita, Gheranda samhita,
A.Avalon; Sat chakra narupana, Paduka panchaka, The serpent power.

What is prezented usually like opening chakras is only a cleaning for output of Kundalini - The serpent power and make it yogins they want selfdestruction in paramatman (nirvana)