Cusser
+1y
1. Put a towel down on the windshield in case you drop something.
2. I'd leave the nut on a turn or two while I wiggle, so if wiggling the wiper arm off gets it loose, then you won't get a wiper in the face.
3. I've had to use a small gear puller or battery terminal puller to get these off, it makes the job easy.
4. I put grease/stick lubricant on the shafts before I reinstall, for the next time.
5. Be glad it's not a 1998-2004 Frontier; their shaft splines are way smaller, and their wiper arms weak metal (bad engineering "perfect storm"), that the arms tend to strip out and then don't move when the shafts move. Dealer-only, about $30. Happened to my daughter (1998) and a co-worker (2002), expect it will also happen on my 2004 some day.