My back is shot also ...but I seeded a about 2 acres by myself . get a broad caster .You can push it easily 2 bad knees also. buy some good perenial grass seed . Get some granuler fertilizer and some straw. put the seed down ,then the fertilizer ,then cover with straw. wet down a little every night and then you will beaching about mowing it in about a month. Go to a feed store they will tell you how much product you need and what setting to set the broadcaster at. goodluck.