I'm looking to buy my first air compressor. I'm not sure what size or what to look for. Mostly what I'm planning on using it for is putting air in tires and changing mower blades. I will have to buy an impact wrench and sockets. Do ya'll use an impact wrench to change blades or do you use a regular ratchet? Also, my ztr manual state what torque to use, how do you know when using an impact wrench?