Proper way of worshipping god in valarpirai and theipirai tithi

Our ancestors started praying on theipirai astami tithi to bairavar to reduce their problems and finish their prayer on valarpirai astami tithi by praying to god to increase their wealth, happiness and good things in life.   During valarpirai tithi from amavasai to pournami one should worship god only for their needs.During theipirai  tithi from  the day next to pournami to day before amavasai one should worship god only for decreasing their problems.This is the proper way of worship. 

Thanks to aanmeegachudar blog.