Will do. Thank you everyone.
I’d make a point of acknowleging the GC’s workload and ask what you can do (and what you must do), and by when, to make the process run smoothly. I’d find out how GC prefers to communicate with your kid. I’d ask how to access Naviance and find out how accurate it is as this varies from school to school. You have your list; ask for theirs. If you have questions about how the school assesses rigor, rank, etc., this is a good time to ask. I’d also ask about how school does LORs, as in when to ask, etc. If you are contemplating any private outside help, I would ask if they think it’s helpful. The response will guide you on whether that person can openly collaborate with GC or should stay behind the scenes.
This much we already know that public schools doesn’t collaborate with private consultants. It’s against their policies and to be fair, GCs in busy suburban schools can’t afford to dedicate their precious time to plotting and scheming of individual snowflakes and their private consultants.
It sounds like you don’t plan to use a consultant, @SugarlessCandy , but for anyone else who’s reading this, there are public districts in which the use of consultants is common because there just aren’t enough GCs to go around. In some of those districts, the GCs are happy to know that someone else is going to spend hours with a kid working up a list of good fits, brainstorming on essay topics, advising on testing, and managing anxious parents. The GC can’t get off the hook for submission of materials, but they can be relieved of some of the other work and have more time for other students (including those who need them for non-college matter) if they know YOUR student is already in good hands. They know that your kids’ list is in fact a reasonable one. That’s a collaboration that’s win-win.
There are other districts s in which GCs feel like it’s a slap in the face and that it signals that families don’t trust in their abilities. In those, if you’re using a consultant, you may not want to disclose it.
Which is why I suggested, if you plan to do this, you figure out what you’re dealing with up front.
@SugarlessCandy you’ve gotten some great advice here, especially posts no. 5 and 12.
I think the best thing you can do is appear reasonable. I always tell people that they don’t have to have all the answers but that they need to go in with an idea of parameters – academic, geographic, financial. Public HS GCs are overworked and aren’t miracle workers. You seem to already have a good attitude and a reasonable grasp of what’s expected. 
Good luck! Ask questions here early and often!
@Youdon’tsay I must say thank you for your encouragement.
You’re welcome! cc is a wonderful – and usually kind – resource.