I had brought a ticket for 2:30 - 3:30 pm guided tour. I would suggest you get an earlier tour…read moretime, since the museum starts closing around 4 pm and you will miss seeing the Hall of State, the throne, and big area with medals and orders that were given to the King of Sweden by countries and ceremonial dress. I think you need to allow at least 2 hours to visit.
For the tour, you have to walk up several flights of stairs. The tour will take you through several rooms including the Guardroom and waiting and reception areas. One side is the Prince's side and where visiting royalty or heads of countries can stay. We were told this area will be closed to the public at some point, so see this area now. I found it interesting to compare the waiting and reception areas with the high ceilings, symmetry, and large, impressive paintings and ornate furnishings to the more modest, lower ceiling Prince quarters (easier to heat in the winter) with the darker, smaller paintings. We were told that visitors can stay in the Prince's areas or elect to stay at the Royal Palace hotel.
The King's area was of course more impressive as were the banquet/entertaining areas.
Changing of the guard is around 12:15 pm weekdays/1:15 pm weekends. There was a sign as well. We saw some changing earlier as well.