I took a chance and clicked on the link. It appears legitimate and didn't trigger any virus alerts.

From the introduction, I can see you are familiar with Mexico and more qualified than most to judge the safety. It sounds like you will be walking mostly on roads.

With your schedule, you will have to average about 20 miles a day with no days off. If you take one day off a week, you will have to average about 22.5 miles a day.

You have a year to prepare, but time is shorter than you think. In my opinion, the most critical aspect of preparation at this time is to start a daily walking program. You should be able to get to the point where you can average 3.5 mph in comfort. This has been shown to be the most efficient speed to walk in terms of energy used, and seems to be independent of height and weight.

If you come back to the board, I'll pass on some more information on walking. I average between 10 and 12 miles a day road walking, and don't take any days off.