Programming ATTiny with Arduino Micro
Note: To program na ATTiny, you can use the Arduino ISP sketch, but have to replace '#define RESET SS' by '#define RESET 11'
You can attach multiple tinys and leave the wiring untouched, but make sure to only power the tiny to program.
In most cases, you can also keep the operational wiring attached when programming (e.g. if you only control an LED)