I’m with you on the mini tantrums - 14 months old now, and he tantrums over the most weird things! I think it’s a rough time right now, as they can’t communicate what they want but they know what they want xxTentatively creeping round here. My LO is (nearly) 14 months old and just starting to understand he has a little big of agency.
Tantrum wise he's generally ok, he's a pretty chill dude anyway but over the last week he has taken to flopping dramatically on the ground and pretending to cry when I take my phone out of his reach (I try not to use it around him anyway, but if I need to answer a call or am facetiming my parents I would have it near him).
Nappy changes and clothes changes have been a nightmare since about 7 months so we just soldier on with those. He absolutely hates being laid on his back and has done for a very long time.