You will need the following tools (the versions used by me are in the brackets):
- Slik SVN (Slik-Subversion-1.6.6-win32)
- TortoiseHg (TortoiseHg-0.9-hg-1.4.exe)
- Python (python-2.5.4.msi)
- Python setuptools (setuptools-0.6c11.win32-py2.5.exe)
Install them and add svn_install_dir, python_install_dir, python_install_dir\Scripts and tortoisehg_install_dir to the system PATH variable if they are not.
Run 'easy_install.exe hgsvn' from the command line. This will download and install the latest version of hgsvn (utilities hgimportsvn, hgpullsvn, hgpushsvn will appear in python_install_dir\Scripts).
That's it! Now you have a Mercurial copy of your repo.