To repair a tire, either you use the spare tire (easy), either you need to reinflate it with a powerfull air compressor. In such case, lift the 4x4 and place the tire on the rim the time that the air put it back on it. You need to be at least 3 persons. Note: you can use the air in your spare tire. For that, inflate it up to 85 psi before going off-road.
Back home, don't forget to go to the workshop to remove the sand that remained inside the tire.