grab your self a comfey seat and a case of beer, find your power drill and go to town. Just remember, the more you put in the middle, the better straight line bite you will have. and the more you put in the outer lugs, the better turning bite you will have.
I have seen some tires with 500-1000 screws in just the rears! so there really is no wrong way.
Another trick is, if you are having problems with the studs pulling out, dismount the tires and cut a piece of carpet to fit the tread area on the inside of the tire, now grab some ice screws that are long enough to go threw the tire tread and screw into the carpet but no to long as to go all the way threw it. Then all you have to do is grab a set of tubes and remount the tires on the wheels