Buddy you need not to think even once,just move on and maintain the speed you feel comfortable on.
And still if you feel uncomfy then rush to a taxi stand and get a driver for 6 hours for yourself.Now get the driver seated on the front seat and instruct you what and how to do.
Rest,again same words 'You drive a compact hatch with a powerful engine buddy',more than half of your tension will be taken by it only and rest half is not really worth thinking of.Just you need to be confident,none else.
On my first hilly trip i had my chauffy to guide me,but on the second one I had just 3 people and none of them knew driving and the car was the Scorpio slx and chauffy just gave me one instruction,which was as follows(exact words of him):-
"Beta,apni side pe dabaa ke chalna,aahista par confidence se chalna and khaai ki taraf chalte time gaadi bilkul kone pe mat le jaana"(Keep on your side,be confident but quite slow and while driving on cliff side,just don't go on extreme corner).
I have been following the same since that day and I think I am safe...
Rest,get your family some sticky thing to eat,this will help a lot by keeping them silent and last:Its a game of just 5 kilometers,after that you will automatically drive like a pro and all the fear will vanish.