So almost all of my growing experience is in a farm type setting. Rows of things and whatnot. I'm looking to plant some legumes in a few weeks and I'm hoping I can just punch some little 4 inch circles into the sod and drop a few fava's and snap peas in an then move along a foot or so and repeat. Anyone with experience planting legumes into grass sod?
Your biggest problem is that a sod based grass especially something like bermudagrass will quickly choke out most new things planted in it. The most common way to combat this is to do something to set the grass back a bit and give the new planting a chance to get started. The way we do our clover planting in the fall is to graze the pasture super close right as it starts to go into dormancy. Then we will drill or broadcast the seeds in. You could also mow close and get a similar result. Some people (and us occasionally) will run a disk harrow over the pasture very lightly before planting. This will tear up the surface roots a bit and set the perennial grass back a bit more and also increase the chance of good seed to soil contact for the legume seeds especially if you run a packer over afterwards.
Diego Footer on Permaculture Based Homesteads - from the Eat Your Dirt Summit