First of all fix appointment in advance and book your slot. Normal duration of a slot is in between 15 – 30 mins for consultancy over phone/online/in person face to face session. Depending on the program, pay the Dakshina in advance.
During a session only one horoscope will be analysed. In some cases, along with astrology, numerology and Vaastu will also be taken in to consideration.
For preparation of horoscope, one should know about his/her date, time and place of birth. I use my own software to make horoscope so one may or may not bring their horoscope along with them. It is advisable to keep ready in advance, the issue related questions for optimum usage of booked slot.