I also had NO PROBLEM understanding the message as written! Beckyezra, please keep contributing to the forum. I don't know where you live, but the very fact that most Americans cannot speak a second language at all, speaks very well for those who live in another country and learn English in addition to their native language. I find it very sad that a fellow quilter here would be so insensitive... and if in fact, if any post has something that a reader doesn't understand, just asking for a clarification is all that is needed!
As for quilting, I would quilt the whole quilt the regular way when the whole top is completed. If you hand quilt or machine quilt, do it when the top is finished.
For the leave in stabilizer, I asked Margo this a while back. When she uses it, she only has it on the areas she pieced with it, not on the other areas. Because it turns to a soft fluff when washed, it almost disappears, leaving only a tiny bit of loft. I plan on using it, and leaving it in and having some areas with it and some without it. Your final batting will help to even it all out when quilting.
Hope this helps!!