As a general training principle, you need to get used to repeated back to back efforts instead of a hard day followed by a rest day.
For the race itself, make sure your logistics are well organised, so you avoid any stress, spend the minimum amount of time faffing around, and the maximum amount of time recovering; e.g.all the necessary kit prepared and accessible, stocks of snacks and drinks prepared so you can grab them immediately after finishing to help recovery.
In a stage race you need to treat the recovery as seriously as the racing, because every bit of wasted time or energy will impact on your ability to perform next day.