Aim to drink and snack as you walk. Allow yourself 15-20 min break for lunch but no more. Avoid stopping for long periods because it will make your legs feel achy and more often than not you will get cold.
Set yourself small goals throughout the day. eg Aim to rest at the top of a hill as a reward for your effort
Tramping is not a race! You should set a steady pace which you can maintain for the day. Never run!
Take turns to lead the group and navigate. Check everyone in the group is ok on a regular basis
Take in the amazing scenery and enjoy the challenge!