Check the accuracy of birth details: -
First of all check whether inputs (date, month, year, time & place of birth) supplied by the client are correct or not. We should ask the client where the person concerned was born (it means either in some hospital or at home & if at home then which people recorded his/her birth details)?

Check the power of planets: -
After generating horoscope, check degrees of ascendant as well as planets. Planets having 0 or 29 degrees will be considered to be on the boundary of two zodiac signs getting reduced in power. If ascendant is on 0 or 29 degrees then it'll have to be determined by checking characteristics of the person concerned which zodiac sign will serve as ascendant. Also in such a case time of birth as well as place of birth will have to be recorded more precisely.

Now check the power of Moon (phase of Moon) by checking how many houses apart it is present from the Sun. If it is present more than 4 houses apart from Sun then it'll be considered to be in good power. If it is present 4 houses apart from Sun then it'll be considered as of average power. if it is present less than 4 houses apart from Sun then it'll be considered as of less power. Here the point to be noted down is Moon can't go more than 7 houses apart from the Sun. If it is 7 houses apart from the Sun it'll be 'Full Moon' (nearly 100% in phase). If it is 4 houses apart then it'll be nearly 50% in phase. If it is only one house apart then it'll be nearly 0% in phase.

Now check which planets are present retrograde & combust in the chart. Mercury if combust will not be taken seriously because its closest to Sun & is often present combust.

Check which planets are present in their own zodiac sign, which planets are present uchcha (exalted), which planets are present neecha, which planets are present in the sign of friend planets & which on the sign of enemy planets.

Which planets are 'Dikbali' (hold power due to their presence in particular direction). Jupiter & Mercury are 'Dikbali' in 1st house, Surya & Mars 'Dikbali' in 10th house, Moon & Venus 'Dikbali' in 4th house & Saturn is considered 'Dikbali' in 7th house. But while analyzing Saturn as 'Dikabali' don't forget that 7th house is the house of marriage, married life, love life & is quite sensitive. Saturn may even harm 7th house inspite of being 'Dikbali'.

Now calculate what would be the age of the person concerned at present. Pay attention to the Mahadashas & Antardashas of planets.

How to analyze a house?
Pay attention to what is the zodiac sign present in that house & where its lord planet is present in the chart (it means in which house & on which zodiac sign). Which planets are accompanying this lord planet & which planets are watching it. Also pay attention to which planets are present in the house under consideration. Which planets are watching this house under consideration.

Now check which planets have exchanged zodiac signs, which planets are present collectively in a house, which planets are watching other planets & which planets are watching each other. Check for presence of any 'Rajyog' in the chart.