I think about this a lot. Unfortunately, I'm a diabetic, so I only survive as long as I can keep hunting down insulin. Plus, we all know medical centers are going to be one of the first places people start ransacking in any sort of apocalyptic scenario. Every time I mention this, someone suggests I could get insulin from either pigs or sheep. They fail to describe exactly how I go about that though and I can never find anything through google.
But, for the sake of planning, let's just assume I have a nice box of insulin that will last me for a year or more. My first step is getting out of the city. Population centers are death traps. Hopefully, it won't take me long to get to areas with less people. Northern Idaho has Coeur D Alene to get through and I'm not totally sure about Western Montana. I imagine it's population as sparse, but I could be wrong. After getting through these two areas, I plan to head eastward for North Dakota. A friend and I jokingly made up this plan to meet up there, but even if something happened where she couldn't, I'd go ahead anyway. Of course, I'd need to loot for supplies on the way. Right now I don't know how to use a gun, but I would like to learn. After North Dakota, I'd head into Canada. Yeah, I'm pretty much copying that section of World War Z where that family escapes into the North Canadian Wilderness. I would keep heading northward, far enough to where I could live off the land, maybe find some semblance of zombie-free civilization. The insulin problem is troubling though. It would eventually run out.
There are a lot of variables to consider, but yeah, that's my basic plan.