Asana for quality change

One cannot "do" an asana for a quality change. We need to introspect and for e.g. one is petty & mean see the good in others and try to change. No amount of hatha yoga practices can change such qualities in human kind. The simplest way to evolve is as Bhagawan Sri Sathya Sai Baba says: " be good, see good , do good, - this is the way to God". Things could not be made simpler- we dont need hours of back bends or forward bends or setu bandas for such issues. The truth is they do not work that way - which is another issue we will take up later.

Too much detail during hatha yoga practice

Some schools of hatha yoga hardly emphasize details while practicing an asana while others

go to excessive detail. Both are not necessary- there is a middle path as always. Medically, too much detail is not needed for practicing yoga poses. This is a generalized approach- though each pose has instructions which vary, however too much detail is better avoided as it has no good or ill effects on the body.