I first saw the film over forty years ago when fell in love with Dick van Dyke and, more lastingly, the schloss and, as my bucket list grew, I dreamed of seeing it for myself. It did not disappoint.
We reached it by flying to Munich and then by train to Fussen. Hiring a car would be a great idea as Bavaria is a beautiful place to visit and the roads are excellent. We then stayed at the award winning "Bed & Breakfast Jackson" in Halblech. Colin and Renata are the perfect hosts in their 5* accommodation, and very knowledgeable about the schloss which can be seen in the distance from their house.
As a top visitor attraction, the Schloss is run a little like a Disney resort and is very slick and efficient. I found the history fascinating and quite moving (I'd suggest Googling it) and, as the schloss is set on the edge of the Alps, the views all around are simply stunning.
Visits are booked in advance with regular guided tours (again this information can be Googled) but I don't recall seeing access for the disabled so this would need researching. There is quite a lot of walking involved and there are stairs to climb inside.
Outside we walked around to the back of the Schloss were there is an iron bridge giving an incredible view not normally seen in advertising literature/chocolate boxes/jigsaw puzzles. It was a great place to take photographs.
The village below, while catering to tourists, is very picturesque and offers horse drawn carriage rides, hotels and restaurants. A ten minute walk took us to the edge of the lake which was mirror-like and incredibly peaceful.
Apart from the Schloss, I learned so much on my first visit to Germany. Things like Bavaria is to Germany what Wales is to England: it has a separate identity/government, etc; the people are exceptionally friendly; the local food is delicious; and cows really do wear bells around their necks!
We visited in July when everything was green and lush but this is also a great part of the world to ski during the winter months if this is your preference.