it depends on your hardware. for this you should do some Google searches for "hackintosh insertspecificationofhardwarehere".
an Intel processor sure would be better.
how to install depends on the version of OS X you want to install. also keep in mind that the only way to get a copy of Mountain Lion or Mavericks is software piracy. there are no retail boxes. for Lion you might be lucky and to find one of those usb sticks they had in the Apple stores back then.