Bathroom - Downstairs Part 1 1//2

Curt sat me down. (Curt is my contractor) Sometimes he gets rather quiet when we are discussing, which can be disconcerting. I am sure it is because I am confidentally waffling on something, and he seems a rather straight-forward person.
He told me what we do first, and I dutifully wrote down the checklist of how we are doing the bathroom. Then called plumbers for quotes. The range for the work was $1300 - 2800. That is craziness in numbers. The problem is I liked the most expensive guy, and Curt told me to hire the least expensive because he knows the company.
Tomorrow is my day to quiz the plumbers. I will ask the most expensive : What the heck am I paying for and why are you charging more? And the least expensive: What aren't you doing? But in my usual friendly sort of way.
All the quotes seemed pricey for what I am doing. It seems like about a two hour job. (But then, really, am I a plumber? Nope.)
As an example of my negotiating skills (not really negotiating, just friendifying) I called the oil company to get a delivery for our furnace.
I asked Paul of my company what the rate was per gallon. He told me $3.24. I was quiet a while, and said wow it has gone up... he then said, let me get my price sheet and see if I can do any better. After a couple seconds he said how about $3.14. I said okay, but that would save me a whoppin' $8.00. He laughed, and kinda clomped around on his calculator and said, yeah, I guess that's not much. How about $3.10? I started laughing and told him I was a baker. How negotiable was this oil?
Too bad we can't do this at the gas pump.