In step #6 you probably may want to advice to use update-alternatives instead of manually removing symlinks, e.g.:
(save default gcc that comes with Ubuntu 12.04)
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.4 10
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.4 10
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.7 30
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.7 30
Make 4.7 the default one:
sudo update-alternatives --auto g++
sudo update-alternatives --auto gcc
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