PythonOCC is hard for a beginer

Hi, gentleman:
I think pythonOCC is not as friendly as what i think.
The pre-condition is that you have to know python and wxPython first,
at least, not for me: a total new hand.

I am a c/c++ programer, but just started trying to learn python and pythonOCC for the first time.
I did the followings: ( I am using windows XP)

1. download and store python 2.6
2. download wxPython (for python 2.6) , and store it
after the installation, the path is:
c:\python26\lib\site-pakages\wx-2.8-msw-ansi (ansi version)

3. download pythonocc (for python 2.6)
after the installation, the path is:
c:\python26\lib\site-pakages\OCC

4. follow the tutorial instructions (it's on the web):
firstly, modified the SimpleGui.py file:
change set_backend('x') to set_backend('wx')
( shown on the below lines...)

if __name__ == '__main__':
set_backend('wx')
init_display()
....
6. on the command line screen, key in the lines like below, and failed on the second line.

>>>from OCC.Display.SimpleGui import * (ok)
>>>display,start_display,add_menu,add_function_to_menu = init_display() (fail!!!)

(the specified module not found! please ref. to the attached bmp file)

How? And what should I do ?