He! He! He! I don't have any problem like this, I can even set a PayPal IPN by myself since I am a tech related guy... enough boasting ;D

If you have a shopping cart software, you follow the manual that comes with it to install it.

Still you can't even understand the manual then there is no choice other than
hiring a Coder for you.

And i go with other above, guru.com and RentAcoder.com works well and have their own reputation.