I don't know much about snow driving...however, here are some basic points:
1. ALWAYS leave your 4runner in 4wd HI. Always.
2. If you anticipate that your 4runner will be buried by the next morning, then LOCK YOUR CENTER DIFFERENTIAL the night before. Why?? Well, if you lock your center diff, then VSC (and dethrottling function of Traction Control system) is turned OFF. With this turned off, you can "power" your way out of a hole...allowing your tires to spin without your engine computer cutting engine power in response to slippage.
If you do not lock your center diff, then in the morning, you may have problems locking your center diff. As you may know, locking the center diff (and going from 2wd to 4wd) is best done with your steering wheel straight and no slippage on any wheels. Also, a running start is helpful...that is, your 4runner needs to be rolling to make the switch quickly. Thus, if your 4runner is buried, then doing the above is difficult with your 4runner stuck in one place.
But, also, remember to UNLOCK YOUR CENTER DIFFERENTIAL once you're clear of any obstruction. You MUST do this to prevent binding of the center differential around corners AND to allow VSC to come ON.
VSC is very helpful for the average owners in slippery conditions, including rain and snow.
3. If you are going to go thru thick/deep snow, then LOCK YOUR CENTER DIFFERENTIAL for reasons mentioned above.
Other than the above points, just be careful. Snow driving is very tricky for beginners (including myself). Getting dedicated snow tires is a very good advice.
Your 4runner should do exceptionally well in snow. My brother's friend has a Toyota Sequoia and he cannot say enough about VSC and ATRAC (4-wheel traction control system).
Have a safe winter,
Thai.