This is a simple guide that will help you install the CFW. This will be basically opening up a file on the memory stick as a regular PSP firmware update and installing that. You will need to install custom firmware (CFW) onto your PSP. The patch requires at least 4GB of open space on your computer, Java, and the windows.
Please note that right now, this patch will only support Valkyria Chronicles 3: Extra Edition because of memory limitations in the original version.
Here are the general instructions on how to use the patch.