soozievt, it's always a good idea to find out what requirements the specific school has for homeschoolers. We contacted my daughter's school very early in the process. However, I don't think we ever asked that question. We just assumed the guidance and school description portions should be filled out by a parent.
I wrote them both, with input from my husband and daughter. We used the school description to tell about our reasons for, and approach to, homeschooling. For the guidance portion, I said up front that I didn't think they would expect me to be objective, so I was going to tell them straight out what I was most proud of in my daughter, and why I thought the school was a good fit.
Of course we'll never know if what I wrote helped or hindered, but she applied ED to a competitive school and was accepted.