Draw a scale outline of your planned enclosure. Some important considerations are the number of sides, the height of the walls and the size.
Spray a circle at the location of the each post, and dig a hole, 1 foot deep and at least 8 inches in diameter, at each circle. Be sure to leave access space between the unit and the enclosure.
Mix the cement according to manufacturer instructions, and pour it into the first hole while your helper holds a post in place. Repeat at each hole. Keep the post straight until the cement sets.
Measure the distance between the outside edges of the two poles that will be the endpoints of a side. Mark a cutline on a sheet of lattice, cut it withe circular saw, and hold the lattice against the poles so that the edges of the lattice and the outside edges of the posts are flush.
Nail (at 7-inch intervals) the lattice to each post. Repeat until you have covered the desired number of sides.