Draw a scale diagram of all the sprinklers in your yard, and use a compass to determine sprinkler separation and location based on radii information provided by Toro Irrigation.
Use a flag or a stake to mark a relative position of the 360 sprinkler in the yard.
Using a tape measure, measure the distance of the 360 to the next sprinkler head, insuring head-to-head coverage.
Dig your trench from the supply line to the stake at 8 to 12 inches deep to insure proper sprinkler height. You can then move the pipe up and down by placing dirt under the sprinkler, depending on the size sprinkler used.
Connect your slip-slip t-fitting to the supply. Use pipe glue and let it set, and then connect your 360 line. A slip-slip fitting means it has no threads.
Glue on the PVC end-elbow ninety degree, which is slip-thread fitting. This fitting has a slip fitting on one side, so it can be glued, and a threaded fitting for the sprinkler. Position this fitting so that the threads point out to the side instead of up. If you were to screw the sprinkler on now, it would spray into the sides of the trench and not up.
Screw on a marlex street elbow, which has a male thread for the fitting, and a female thread for the sprinkler nipple. Wrapping Teflon tape around the nipple three times will suffice. Screw the nipple into the female side hand-tight.
Screw on, hand-tight, the Toro 360 sprinkler on to the nipple. Notice that the sprinkler will now rotate in one direction. This is done in case of a lawn mower hit or kids kicking it, the sprinkler will have a bit of give and not break. The sprinkler should be at grade level, flush to the ground.
Blow out your sprinkler line by running water through the line before screwing on the sprinkler nozzle. Run water till the water coming out of the sprinkler body is clear.
Screw on the sprinkler nozzle hand-tight. Test your sprinkler before covering the trench. Check for leaks, and if there are none, cover the trench.