Before you start your trek. I would ensure that you have heavy duty tubes installed. Depending on what type of off road terrain your going to be riding I would bump up your tire pressure just a little to help ensure that a pinched tube is avoided. Three tire irons are pretty much the norm.
This guy here is a life saver
The bead buddy here is very nice to have also.
And the longer the tire iron (spoon) you have the easier it is to mount and dismount a tire. Plenty of lubricant. A small bottle of dish washing soap cut with 2/3 water works best for me.
One last thing that I will mention having the right compound tire makes all the difference in the word. I found these tires called MOTOZ, and they are by far the easiest desert terrain tire I have ever mounted. I would compare them to mounting a SX race tire but just a little more on the stiff side.