It should be simple. But if you're not absolutely sure, get some advice from an electrician.
Note: You can buy IEC sockets (computer/kettle cord connector - called IEC C14 connector) with switches and fuse holders in them for very little. You then wire this up to your PSU (make sure to get the Active/Neutral/Earth right), and just use a standard IEC cord to connect it to the wall.
Note: You can buy IEC sockets (computer/kettle cord connector - called IEC C14 connector) with switches and fuse holders in them for very little. You then wire this up to your PSU (make sure to get the Active/Neutral/Earth right), and just use a standard IEC cord to connect it to the wall.