well when accellerating start out at a crawl and work your way up to prevent breaking loose.... since 4wd only means 2 wheels will turn when you loose traction anyways.
when braking.. test the surface your driving on first... if its loose when you hit the brakes ( aka you feel the tires grab but the truck slide) PUMP the brakes.... do not hold them to the floor ,as you will just skid to a halt..... most of the time into someones rear end.
when 4x4ing out in the boonies(outdoors for you non midwestern peeps

) always make sure where you go forward, you can always drive out in reverse. That goes especially for areas that youre not familiar with, along with getting out of the truck, lets say before you climb a hill, make sure there isnt a ditch or a huge hole covered up by the snow.. if its hardpack more than 3 or more feet deep dont even bother unless you get a good run.... with any bad luck( like Mine...hehe) youll find a "pocket" and get the truck up to the frame in snow.... when that happens I hope you got a shovel.
Anyways, just take your time... get used to the vehicle before you try and push it at all, and if the roads are icy.... leave it in 4 wheel drive...the handling suffers a little but the vehicle will be much more true in braking and driving at more of a constant speed, the only downfall is consuming a little more fuel.