Prepare the surface of the outside of the older home to receive the stone veneer. Remove, if necessary, the existing siding or cover it with cement fiberboard siding or backer board to provide a clean, oil-free surface on which to install the stone.
Measure the project surface area to determine how much stone to buy. Measure the vertical length of the corners and determine how much corner-shaped stone to buy.
Lay the stone out near the work site. Mix colors and sizes to suit and plan the stacking of the corner stones.
Trowel modified thin-set mortar on the project area beginning with the corners.
Set the corner stones first, starting at the bottom of each corner and alternating the long and short legs of the corner stones as the stones are placed around the corner. Spread mortar on the back of each stone with a mason's trowel before pressing the corner stones into the troweled-on mortar.
Spread mortar on the back of each surface stone and press it into the troweled-on mortar. Adjust the size of the stones as needed with stone nippers by using the end of the nippers to nip away the stone until the stone fits into place. Stack stones close together if you don't want to use grout.
Let the mortar dry completely according to manufacturer's instructions.
Put more modified thin-set mortar in a grout bag if you want to use grout and point the bag's tip into the joints between the stones. Squeeze the bag and fill the joints with mortar. Wipe off any excess with a damp towel.