pip is an install tool for Python, similar to but more modern than easy_install. It is now the preferred tool for install TiddlyWeb and associated plugins because it is deals better with namespace packages and resolving requirements.

See: http://pypi.python.org/pypi/pip

If pip is not available on your system it can be installed following instructions at the link above, or if you are an working easy_install:
   sudo easy_install -U pip


pip and virtualenv make is possible to install TiddlyWeb without root access.