Set your hz down from 60 to 30 (this will roughly double your battery life).
Practice changing batteries in the dark
Practice with the menus, especially the zeroing menu. You must "unlock" the reticle prior to zeroing and it is prudent to "lock" it after you are zeroed, though power cycling the device will auto-lock it.
I turn the display auto-dimmer off
Batteries should be set for "3" (assuming you have a mark 3) but check it.
Settings on start up set to user
symbol sleep mode I set to 15
video out will be off by default.
Practice nucing and changing pallets and zooming .. I use those three the most ... digital focus I use a little.
Practice adjusting the contrast and brightness, those are useful to optimize image.
But mostly get out there and use it outside !!!