I would say that is better, if possible, to arrive a week before. If not possible then try to get there a couple of days before, because if it's a long trip... it will sure be tiring.
On the other hand, you'll need to plan ahead your meals. For instance, if you are used to a diet at certain times, you may not be able to carry all the food with you... and consider if there are restrictions in the airport for carrying certain food.
What I did on a trip, was get plenty of protein bars, packs of protein shake or meal replacement, carb bars and my bottle with water. So when I needed my meal, I try substitute according to what I needed to eat. I also had lunch at the airport.
If you plan ahead there will be no trouble, because you'll have everything at hand.
When you get to the location, try to sleep well because long trips may get you so tired that it may be difficult to recover quickly.
Hope this helps