How do I replace glass on ipad 4?

Much the same as the previous two versions of iPads 2 & 3. Be very careful from the left of the home button to the left hand corner of the ipad as you look at it. There is a new home button flex which is adhered to the digitiser and the connection is housed underneath the LCD. Once the LCD is removed from its housing you can disconnect the home button flex as you would the digitiser. Peel it away and re use. I found that a little less care is needed around the volume mute button area as these flexes are now housed underneath a bracket but everything else is pretty much the same.

Hope this helps.