Just found this on the Wembley Stadium website, which allows you to see what your view will be like from your seat at Wembley.
Wembley Stadium - View Finder
Use the stadium planner on the official site to find out were your price of seat is located in the ground FA Cup Semi-Final Details – – evertonfc.com – The Official Website of Everton Football Club then look on your ticket to see what entrance you go in. Once you have found the area you are sitting in on the viewfinder click on it and it will show you your view. Very easy to use.