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The IF BEGIN/END structure in SQL is used to control the flow of code execution based on a condition. Here's an example of how to use it properly in a lengthy SQL script:

1. Start by defining your condition, for example:

   IF @Variable = 'Value' BEGIN -- Run the code here if the condition is true END

2. Any code that needs to be executed if the condition is true should be placed inside the BEGIN/END block.

3. If there are multiple conditions, you can use nested IF blocks to handle them:

   IF @Variable = 'Value' BEGIN -- Run the code here if the first condition is true IF @SecondVariable = 'SecondValue' BEGIN -- Run the code here if both conditions are true END END

4. Make sure to close all BEGIN/END blocks properly, i.e., for every BEGIN block, there should be a corresponding END block.

5. Use indentation to make the code more readable and to clearly show the nested IF blocks:

   IF @Variable = 'Value' BEGIN -- Run the code here if the first condition is true IF @SecondVariable = 'SecondValue' BEGIN -- Run the code here if both conditions are true END END

Using properly formatted and indented code will make it easier to understand and maintain the script.