Best of luck with your trip - a couple of points to consider.
Routing from Dundee is OK but unless you have a particular need to stop at Dundee then Glenrothes (good restaurant) or Perth (cafe but lots of runways) make better stopping off points.
Suggest you google mountain flying, there is some good material on the net, much of it Canadian or US - that will give you a clue as to what to expect.
Flying with the wing leveller connected if there is anything over 10 kts may not be such a good idea. Just moving from one side of the glen to the other can take you out of strong lift into the equivalent sink and requiring significant power.
Picking the right route on the leeward ridge can allow you to 'surf' along, conversely it can make life difficult getting it wrong. There is no mystery to it, the material on the net explains it all. But there are times when nature aborrs straight lines.