Tilling the garden will be easier if you leave an untilled row between passes. Wide turns are easier to make with a tiller than "about faces." Also, the machine won't pull itself and you toward the next row, which it tends to do if you come close to overlapping rows.
When tilling heavy clay soils or breaking ground for a new garden, reduce the tiller's engine speed so that it turns the soil more thoroughly with less bucking and bouncing.
When tilling ground for the first time, don't try to work it to the maximum depth in the first pass. The first time around, set the brake stake to half the desired depth. Then set it for full depth and go over the ground a second time.
Till only when the soil is slightly dry and easily crumbled. Tilling when it's too wet leaves large clods which become rock-hard when dry. Mud clumps clinging to tiller blades upset its balance, causing undue wear on you and the tiller.