So I reall want to do the DIY radiator flush on my 02 Maxima. Help a newbie out.

1. How much antifreeze do I need and I am assuming Prestone is the one to go with?

3. Do I buy 50/50 or add water? Do I use tap water or what this DIY site says, soft water, what is that?

4. How do you flush the system, run it with all water and flush that out a few times?

I found this nice DIY website, so it should be pretty easy to do in my garage.

http://www.motorvate.ca/mvp.php/502

I might be tempted to have a juffy lube do it for $39.95, but I would not mind me doing it myself.