I'm playing around a bit with 1 now. I've actually done a bit of 2 and I can tell you that the idea of growing enough calories to feed yourself is fairly daunting, which makes 3 a bit difficult (although I've had problems with that anyway I suppose).
Don't buy things you don't need and avoid products that don't last (i.e. break in a year or two). Try to repair a broken product first, before buying a new one.
Minimize commute & travel. Use public transport when you do.
Talk to other people how you did it, so that ideas can spread and norms change.
1. Build energy independence by switching to renewable energy sources for your home.
2. Acquire skills that might be useful in a changing climate, such as gardening, home repair, or first aid.
3. Maintain mental health while dealing with the realities of climate change