I wouldn’t bother with bar tape, just get some quality mitts to wear.
I would pay attention to your bottle cages, they really do need to be able to grip the bottles or you will be shedding them along the way.
Pay a lot of attention to getting the tyre pressures right for your weight. You need them to be as low as possible without pinch flatting.
Try not to be too close to the rider in front as you hit the cobble sections. Most of the accidents I have seen (I’ve ridden it 3 times) are by being taken out by an inexperienced rider crashing or breaking in front.
Wish I was riding again this year!
BB