I second the motion... Bobby!
Here's the snowflake symbol that can be found on properly rated tires. So far, I've only seen them on the aforementioned BFG All-Terrains and on Pro Comp All-Terrain tires. You should see them on the side of the tires along with max load, psi rating, etc.

Bridgestone Blizzak I heard is one of the best tires for snow but useless (for the most part) in Cali unless you live in an area prone to snow for most of the year.

From my understanding, between cables and chains, cables are much easier to put on and more expensive. Chains are cheaper, gives you better traction, but a pain to install. Drivability is very much affected with either one, worse with chains. Most, if not all, come with a cable/chain tensioner which is vital in keeping the chains/cables in place and not wrapping around your CV, steering, etc.
Like what Bobby said, slow and steady and leave enough room all around you. And remember, you can still slip and slide and toss all around even with cables/chains so don't rely on them too much. I'm speaking from experience driving a front-wheel drive van with chains.
Cables/chains ideally are mounted on the "drive wheel" meaning the wheel that moves you. If in 2WD, that means your "rear wheel." If you're going all 4's, then all of them should have one installed.
Again, if you're on your way to the ski/snowboard resorts up in the mountains, a lot of times the CHP will just verify if your vehicle is indeed 4WD and you just have to "show" that you have a set of chains, whether they fit or not. Unless the weather conditions are so bad (called R3) and you are required to have 4WD and chains at the same time.
The following info is from the DOT. It shows how to interpret road conditions and chain/cable placement. Hope this helps.
=================================================
Chain Requirements
R1: Chains are required - snow tread tires allowed.
R2: Chains are required on all vehicles except four wheel drive vehicles with snow tires on all four wheels.
R3: Chains are required - all vehicles - no exceptions.
R1 and R2 are the most common conditions. The highway is usually closed before an R3 condition is imposed.
=================================================
http://www.dot.ca.gov/hq/roadinfo/ChainRequire.pdf