Kinda an odd time of year to ask this.

It doesn't matter what you do with the ball before a round. Mainly keep the balls in the house where it is warm.

Put balls in pocket, switch ball every hole.

Since you are apparently in a place where there is a golf season, during the off season you throw the rules out.

Change the ball every shot instead of every hole, keep a hand warmer in you pocket.

I use two balls during the winter. When I get to the green I pull out the other one from my pocket, which was next to the hand warmers. I don't think you are supposed to do this, but I agree with John...I throw the rules out when I play in the winter. I have a truck so I always put my clubs inside when driving to the course.

Sounds like desperate measures, at what point have you crossed the line ? It's a game, you will never achieve your desired results with this kind of outlook, work on your game a bit harder stop looking for a quick cheap fix.

Andrew I just gotta ask, what???????????