won't hurt the paint as long as it's done correctly.
are you planning on doing it yourself or having someone do it?
You can clay it yourself, it's quite easy to do actually, just don't drop the clay bar because if you do it's unusable at that point. (I always keep spares)
You can probably cover up the slight swirls with a good polish or wax. I've always beena big fan of Zaino's products and they even have a sealer that is quite good. (though admittedly I haven't used it in quite some time)