Using SQL 2008 R2 installation media on a Windows 7 RTM installation:
1) Install the setup support files. There is no way around this. The installation won't continue until you do this.
2) Take care of any prerequisite issues if any are highlighted during the check.
3) FEATURE SELECTION - Under Shared you can select one of the Management Tools options. This will give you your Management Studio.
4) Profit.