I covered programming an ATtiny with the Arduino ISP in the
ProgrammingWithArduinoISP project.
Since I’ve been programming a few more ATtiny processors, and simplify the processing of programming an ATtiny with ArduinoISP, I wired up a strip of protoboard to serve as a custom programming shield.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub