Step 1 and 2

The first thing I always do is to remove the two shorter screws described as number 1 in the picture above. Once they are out, I then remove the two long ones at the top, number 2 on either side of the viewfinder lens. Sometimes they will be very easy to remove, and sometimes they will seem quite stuck and impossible. Or anything in between. But, perserverance will reward you once you have all four removed.