RE: maine bear hunt
I would suggest practicing your shooting with a head net and a thin pair of camo gloves on. It's not to tough to get used to, and the benefits are you don't have to spray stinky bug spray on your hunting clothes and your sit will be a lot more comfortable. I absolutely hate when the no-see-ums and mosquitoes bite and suck all the juice out of your body from the backs of your hands, knuckles and wrists! Plus it's hard not to get busted if you keep swatting bugs away from your face and neck!
The thing I have found hunting the early bears are that it tends to be hot the first hour or 2 in stand, but as the sun sets the temp drops dramaticaly, so having something to slip on quietly for the last hour makes for a more comfortable sit.
Don't sweat the gear to much.. if you are hunting over bait you can pretty much leave everything except the essentials with the guide or at camp.
The 1 thing you really should consider bringing .. a fishing pole! There is some awesome fishing in that area of that state .. and bear hunting is usually an afternoon thing, so you'll have time to take advantage. Good luck!