G2 post should be space average of 50' for one wire (cattle and horses) or if using multiple wires (goat and sheep) spacing should average 20' to 30'  You will need to drive them 12 to 18" into the ground, and we recommed looking into purchasing a core driver of equal size to help install them. The core drive acts as a stabilizer and starts the pilot hole when driving the G2 post.