I noticed that pic as well, if your yard will be the same slope as theirs, it won't be bad to mow at all. Mow sideways, not up and down. There's nothing quite like hitting a wet spot mowing down hill and starting an uncontrollable slide toward whatever danger lies at the bottom.
If it's to steep to mow sideways, you probably shouldn't be mowing it.
Though I have to admit, growing up in Athens county, I've mowed many an area either sitting on the uphill fender, or making a desperate turn at the bottom because there was just enough room.
Have fun!