Steven rented a hammer drill from Home Depot and learned how to drill concrete. Four holes, less than a minute each. Not so difficult, if you have the correct tool. Steven’s hand drill, even on hammer settings, would not cut the mustard.
Bolts inserted, post fitted, washers on, nuts wrenched down. Post up.
Then it took another hour to drill out the concrete from around the existing/old mailbox post. The post would not come free. Steven texted Gilsa Concrete for assistance winching or cutting the old post. They opted to cut. Turns out the post is solid steel, not hollow, mounted in place with a second ball of concrete at least two feet down; that sucker is not coming out, and we will leave a segment permanently buried.