Dig down to a depth of two to four inches to make sure you get all the grass roots as well as the top growth. You can start pushing and pulling the shovel horizontally, keeping the blade as level with the ground as possible (figure B). Work in small sections: the combination of soil and sod can be pretty heavy. Use the excavated soil and sod to level uneven spots in your lawn, or use it to start a new compost pile. To do that, simply stack the layers of sod upside down on the bare ground. Then water well, and cover the pile with a tarp--not clear plastic. Soon the grass will die and you'll have the makings of a great compost pile. Or you can use the sod to repair bare spots in your lawn. Prepare the bare spots by loosening the soil somewhat, then cut the sod to fit and plop it down. You may also prepare a new garden spot by placing several layers of newspaper over the grass and covering it with a thick layer of leaves or mulch to kill the grass. That approach works great, but it takes several months to a year to kill the grass.
After you've stripped your new garden spot clean of sod, get rid of any roots and rocks lying around, tidy up the borders, add a little compost over the area, and work it into the top six inches of soil with a tiller. Level the soil with a rake.
At this point you could go ahead and plant, but disturbing the soil has unearthed many weed seeds that are now ready to germinate. Water the area well and wait a week, at which time those weeds will have sprouted, and you can easily get rid of them with a hoe or your hand. Repeat the procedure one more time, and you'll have eliminated most of the weeds.