Some good ideas in the article.
I have done quite well using the iPhone as long as there is adequate lighting. I would still use the forced flash even in broad daylight if the subject is wearing a brimmed hat for fill flash. The iPhone flash will likely not be enough if it's getting dark. I carry a small gorillapod and iPhone clamp and when combined with my trigger sticks can take photos high or low. I also have a tiny, wireless bluetooth remote to snap my own pics. If you use a phone to take these pics, make sure you learn how to get the subject in focus and not have it automatically focus on the hill in the distance.
Instead of water and toilet paper I bring water and paper towels (which also function as toilet paper when needed). Also, a rubber band works great to hold the mouth shut and tongue in. If time permits, take pictures first, gut after.
I am not a fan of blaze orange vests in these kinds of pictures mainly because the color is overpowering, especially if it's one large block of solid color in the middle of the picture. Even in mandatory blaze orange hunt areas, I prefer to remove the vest and keep it out of the pic.