Subaru's are different than Honda's, that's all I have to say. There is a special torque sequence that Subaru's require, I know first hand, because I mess it up the first time changing the head gasket. I got it right the 2nd time around after learning how to torque the head bolts down the proper way. Make sure he knows the sequence and torque rate for each bolts, other wise, it's going to fail quickly.
I have nothing cool to say here