Having installed/replaced two dishwashers I can tell you that you should have no problem replacing it and keeping your floor nice and pristine. The installation directions for the dishwasher are very good about protecting the floor - even doing things I normally wouldn't have normally done (or cared to do) to protect the floor. With the proper tools and connectors, you should be able to install in an evening.
Be aware that at 10 years old, you may need a newer connector for your water line. Check the instructions and follow them closely when it explains how to figure out the connector you need.