Anyone that can explain how a 1031 exchange works very simply?

[Christine Mwai]

I'm looking to sell one of my rentals because it is free and clear and even though it is a great property in a great neighborhood, I think I could do better on the cash flow. These are my questions and I appreciate any and all feedback..this is not something in my comfort zone, but always learning.

1. I was quouted a fee of $1000 by an online company I called.

2. Since the premise of a 1031 exchange is that the 3rd party holds the funds from the sale of property "A",  how do I find a company I can trust with my hard earned money.

3. Can one add funds from what property "A" sold for to buy "property B"... 

4. Can the funds added be from someone other than me, the original owner of property "A".

Thanks for any and all input. This is not an area I am familiar with so give me grace if my questions sound off..