I have never used Tour Guide Mike, but here is my advice.
#1 Stay on property, you don't want to be shut out because of capacity issues.
#2 Go to the parks early, like rope drop. By 11am-noon, the parks will reach or near capacity and will be unbearable.
#3 Take advantage of extra magic hours.
#4 Relax and take in the holiday shows, parade, fireworks and decorations. This is not a trip where you plan on riding Space Mountain 10 times in a day....not going to happen.
#5 Have dinner reservations. There will not be any walk-ups anywhere on property.
#6 Do not go to the parks in the middle of the day. Instead, spend time at the resort, go golfing, go swimming or take a nap.
We have gone to MK on NYE and it is nuts, but we loved it! There is such an energy and rush, with everyone celebrating the New Years! I have never been to Times Square on New Years Eve, but MK has to be close to that experience. ABC will have their camera crews their, so make sure they wear something to stand out. We actually ended up on TV the first year we went. It helped that we were standing on a high point and we are tall.
If she wants specific advice, send her my way. I may save her some headaches.