This video tutorial has a good illustration on how to remove the head and heat it to remove the eyes. It has been suggested that globe eyes work the best in a Gotz doll rather than using the putty and a relatively flat eye, but this gives a different approach as you can actually use different eye types within a Gotz doll. Alternatively I have found that using the blow dryer method to heat the neck is also effective if you don't want the mess of boiling water. In that method you would hold the blow dryer on the "heat" setting several inches away from the neck and hold 10-15 minutes until the neck became hot and soft enough to remove the head. This is also a method that can be used in inserting the eyes from the front.