The Arduino IDE is used to write programs. To transfer the code to the ATtiny you need an ISP programmer. Debugging is much harder as there is no serial interface to transfer data between ATtiny and your computer- the monitor function of the Arduino IDE does not work. A very good description how to set up the Arduino IDE for ISP programming is here: http://harizanov.com/2012/08/setting-up-arduino-ide-for-working-with-attinys/. A simple solution to get debug information is to send them via the RFM12B.
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