How Can a User Estimate the Correct Gas Limit for a Complex Smart Contract Interaction?

Users typically rely on wallet software or blockchain explorers which perform a 'dry run' or simulation of the transaction on a local node. This simulation accurately calculates the 'Gas Used' without actually broadcasting the transaction.

The user then sets a Gas Limit slightly higher than this estimate for safety.

Can a Pruned Node Serve Historical Block Data to a New Node Joining the Network?
How Can a User Prevent Running out of Gas?
What Is the Difference between ‘Gas Limit’ and ‘Gas Used’?
What Is the Difference between Gas Limit and Gas Price?
How Does the UTXO Set Size Impact the Memory Requirements of a Full Node?
How Do Wallets Help Users Estimate Fees?
How Do Self-Custody Wallets Interact with Token Ownership Standards?
Explain the Role of a CEX’s Hot and Cold Wallets in Managing Double-Spend Risk