Blinkin’ or other sample code for PIC18F458 would be a great start.
Or if anybody would give simple lessons on how to transform code between different PIC´s.
You’re more than welcome to give this hex file a try. No guarantees, I just recompiled the 452 code with the 458 headers.
http://www.sparkfun.com/tutorial/TestHe … nk-458.hex
-Nathan