Appraiser for USDA ..how to meet and greet

[DG H.]

Im selling a rehab flip in Texas. The buyer is going with a USDA loan. The appraiser will do the appraisial next week. I am selling my own property and don't have a REALTOR. I do work with one that will give comps to the appraiser.
]My question is this...can I ask them questions like ...do they think the house will appraise or how much did it appraise for? I really don't know the dynamics of what I can do or say. I've only dealt with with one appraiser before and he was....not nice at all. I didn't ask any questions of him and tried to answer his qrstions and show him what he asked for.
What is the magic answer....of course I NEED this property to appraise.

Thank you
Dee-Texas