It's not hard. Find a buddy to help you hang the piece, watch few videos on Sheetrock muddling and you got it whooped. Like someone stated earlier it would be a minimum of 2-3 seperate trips for the mudding process if you hired it out.
Are you going to lay the tile? If so I recommend the Schluter System with pre sloped pan. Easy to work with! I just done this one not quite complete just yet. I lack hanging glass door and installing hardware!
Edit to add link...