I've done heads before in the late 70's and 80's. Didn't everyone back then? Was usually done using a cherry picker someone always had one but it was a lot easier at the base auto hobby shop with the proper tools and equipment. Now days with all the crap and connections on engines no way would I would do it. But that is just me.
I moved to Mn. from Asheville, NC and prior to that lived in Currituck while based in the Tidewater area. My youngest sister and mother are in Wake Forrest. Moderate climate for NC is a good description if not a great one.
I get my engine oil from Costco by the 20 gallon case at ~$50 for either 0-20 or 5-30 so I run 0-20.
But there is nothing wrong with 5-30 and if in NC wouldn't hesitate to use it. From the Dubai 2023 Lexus GX 460 owners manual. I've spent some time in Dubai and I wouldn't call the weather moderate there.