Some auto parts stores will install wipers for free with purchase. I know Autozone in PA offered me this, but I declined as I could do it myself. This was a few years back tho (2019?), as I was traveling and had immediate need. I usually buy several wipers at a time from Rockauto so I have them on hand.
I have a 22, which is the same wiper as 24 and it takes some force to change it. In fact, 3 mechanics tried and failed, mine was one of the first ones of the new style they attempted. when the 3rd guy said something about a pry bar, I looked at the new blade, then stuck my fingers between the blade and arm to get more leverage and popped it off - it took me a few tries and my fingers hurt a little, but I got er done. . Service manager joked if I wanted a job there LOL