Last time I hunted the San Carlos was about 15 years ago. At that time if you looked like you were hunting many people asked how your hunt was going. The first time on the unit I hired a gentleman that said he knew where the javelina were. Paid him $100 for the first group of pigs and $50 for every group after that. Cost me $200 but over a number of years we took about 15 pigs out of the areas he showed us. Taking him with us that first day really jumpstarted our trip after never seeing the area before.
My hunts were all archery, but any gun that is legal and you can shoot will do fine.
The roads on the reservation can get nasty very quick. Flashfloods occur very often and can strand or swamp you if your not careful. If it starts to rain or you have snow and the temps. start to raise, watch yourself, and make sure your on the right side of any "dry" creek beds. Make sure you go ready for bad weather. It maybe arizona but the reservation is higher elevation and gets cold and wet.
We looked for prickly pear, in hilly rocky areas, with hardwoods in the bottoms of the canyons. When we found that combination we usually found pigs.
Can't give you any specific information, but hope it helps and have a great time.