Starter Relay is a 0. (I give the Blower a 4, and the Torque Converter a 9.) I've never done the Oil sending unit, but once you know where it is, it's probably easy.
Oil sending unit is pretty easy, I give it a 3. The only reason for the 3 is its a bit tight fit (but you can move the line thats in the way), oil pours out for a sec (but not a strong flow, just a little one you can easily plug), and it was hard for me to find. I kept looking at the bottom rear of the motor near the filter, and then I realized it is in the front on the bottom drivers side. Once you know what the oil sending unit looks like you will undoubtedly see it. I can post a pic of it if you need one! But real easy and simple install!