VS Beta 1, DSL Tools and VS Beta 2
Steven is struggling with DSL Tools installation. While it's true that the actual DSL Tools download is very small it is equally true that the current version requires Visual Studio Beta 1, which is indeed not so small. In the near future there will be a version of DSL Tools for Visual Studio Beta 2 after it comes out.
Once you get the bits near you, the installation itself is very straightforward. I suggest to install them on a virtual machine, as the versioning story evolves quite rapidly (and upgrades/uninstalls may not be supported). So, grab Virtual PC or a similar tool and do the test installations there.