Dandy, the protagonist of the story "The Thief's Story" by Ruskin Bond, prepares for the robbery at Shotover Grange in a systematic and calculated manner. Here are the details:

Gaining Information:
Dandy first gathers information about the target- Shotover Grange. He spends several days observing the house, its surroundings, and the daily routine of the residents. He also learns that the house has a safe containing valuable jewelry.

Forming a Plan:
Based on the information he has gathered, Dandy forms a plan to rob the house. He decides to enter the house at night when the residents are asleep, and steal the jewelry from the safe. He also plans to escape through the window to avoid detection.

Preparing the Tools:
Dandy prepares the tools he needs for the robbery. He makes a duplicate key of the main entrance and a small saw to open the safe. He also carries a flashlight and a rope to facilitate his escape.

Executing the Plan:
On the night of the robbery, Dandy enters the house using the duplicate key. He carefully avoids making any noise and reaches the safe. He uses the saw to open the lock and steals the jewelry. He then escapes through the window using the rope.

Covering His Tracks:
After the robbery, Dandy covers his tracks to avoid detection. He carefully locks the door from outside to make it look like the house was not robbed. He also hides the tools he used and changes his appearance to avoid recognition.

In conclusion, Dandy prepares for the robbery at Shotover Grange by gathering information, forming a plan, preparing the tools, executing the plan, and covering his tracks. His preparation and execution of the robbery reflect his professional and meticulous approach to his profession as a thief.