Preparation:
1. Add Passenger details in Masterlist before booking
2. If more trains available for that route, choose the best option to book (we can give only one shot in that time)
3. Try Premium Tatkal instead of Normal Tatkal (For sleeper)
Booking:
1. Login to IRCTC App/website at 9:55/10:55.
2. Search for Train details and wait sometime and go to train screen at 9.58/10.58.
3. Exactly at 10:00:05/11:00:05, click the seat availability (Each screen will take its own time, dont come out, be there).
4. Each screen will take atleast 1 min.
5. When u get 'unable to process request' error, try again in same screen, it will go thru in 1 or 2 attempts.
6. In the passenger details screen, nowadays Passenger details is not fetching automaticaly, So in 1st try if it not fetched try to enter manually.
7. Dont forget to choose the option 'Book ticket only is Confirm berth is booked'.
8. Advantage of Prem Tatkal booking, For the 1st 5 mins the Ticket amount will be of Normal Tatkal rate (after every 10% of ticket booked in Prem tatkal, 20% increase will be there in that ticket fare)
Since in tatkal time server is overloaded, system will take atleast 5 mins to move to next slab. So once u get the amount locked in the next screen, u have high chance of booking Prem tatkal tickets in normal tatkal fare.
Even if u forget to choose 'Book ticket only is Confirm berth is booked',once the tickets are full before u get confirmed ticket, ur tickets will not go to WL, since Prem tatkal quota dont have WL.
9. Try paytm UPI and preferably PayTM/HDFC accounts linked with it.
Even if u dont have tickets to book in the upcoming days, try to practice and go till the Ticket amount screen or till UPI screen to feel the process and accustom to the practice.