Editing hex values is as simple as it gets really imo (it's no different than a text editor in some ways). It's not nearly as complicated as most people try to make it out.
1) Download a hex editor (wxHexEditor is fine).
2) Open up the disc image in the hex editor. Go to the offset 0x20 (the 32nd value in the file). in wxHexEditor, you can use Edit -> Go to Offset. wxHexEditor by default has another window that shows all the values as human-readable characters, so it will be very obvious where the game title is.
3) Look up the hex values for the ASCII characters you want to replace: http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters, e.g. lowercase s = 73 in hex
4) Just type in the values. wxHexEditor will overwrite the current hex values.
5) Save.
1) Download a hex editor (wxHexEditor is fine).
2) Open up the disc image in the hex editor. Go to the offset 0x20 (the 32nd value in the file). in wxHexEditor, you can use Edit -> Go to Offset. wxHexEditor by default has another window that shows all the values as human-readable characters, so it will be very obvious where the game title is.
3) Look up the hex values for the ASCII characters you want to replace: http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters, e.g. lowercase s = 73 in hex
4) Just type in the values. wxHexEditor will overwrite the current hex values.
5) Save.