The installation of pip depends on your system. For instance under ubuntu it is as easy as
sudo apt-get install python-pip
Another way to install it if you are familiar with virtualenv tool consists in creating a virtual environment since pip is installed into it automatically.
This does not require root access or modify your system Python installation. For instance:
virtualenv my_env cd my_env source ./bin/activate # test if pip works pip install pip
If you do not have virtualenv, you can still install pip easily by installing setuptools or distribute from your distribtution.
For instance you could try:
wget http://python-distribute.org/distribute_setup.py python distribute_setup.py
Replace wget tool by curl under MacOsX
Under windows, you can google it. I have not tried myself but here is an example: