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1. First, you need to create an instance of the class that defines the method you want to invoke.

2. Next, you need to use dot notation to access the method from the instance you created.

3. Finally, you can pass any arguments the method requires and store the result if necessary.

For example, let's say you have a class called Calculator with a method called add that takes two arguments:

class Calculator:
    def add(self, a, b):
        return a + b

To invoke the add() method from a different class, you would first create an instance of Calculator:

my_calculator = Calculator()

Next, you can access the add() method using dot notation:

result = my_calculator.add(2, 3)

In this example, the add() method takes two arguments (2 and 3) and returns the result (5). The result is stored in the result variable.