Just put a bucket to catch the fluids when you unhook the hoses from the pump. When your done replacing it just run you car a bit and poor it back in the overflow tank. It should take it all back in.

The polarity for the pump is pretty easy as well. I bought the plug to go with the bosch pump. I just tapped just behind my factory plug and added the connections. So if later I want to plug the stock pump back in. Look at your pump with the plug in and it will show + or -. Grab some spades and just make sure to connect + and - correctly. All the brackets and hoses should fit like factory. If you need pics let me know.