Hope you've invested in an on-bike video, this
would help you to learn the course better before you arrive. Off course it's not the same as the real thing!!
As you're thinking of a long trip over to the island, it'll be worth spending a week before the practise starts to just keep riding/driving around the course to get yourself familiar.
I'm sure you'll make the qualifying time easily!!
I did the Manx GP and made the time easy!
Good Luck!