There are many mantras in vedic textbooks which are mentioned for one’s specific needs and it’s also said that you have to do this much jaap to attain the mantra siddhi.
My question is that do everyone can have a customized mantra that give more and fast result rather than following general one?

Lord Ganesha mantra jaap is generally advised if any obstacles is there .
If the native is having pisces asc & leo as 6th lord , does kaal bhairav mantra helps him get rid of obstacles? which will be more fruitful?

You noticed any such remedies working ?
please share if u had

I would also like to know whether any such customized mantras are helping them?
If yes how the deity whom one should worshipped is to be find out?
Problem – House – Lord – Lord sitting naksatra or planet sitting in that house – planet sitting naksatra
Which one?