Chapters 8 and 9 go over six more plagues that the Lord does to show His power over everything and that He is Yahweh.
The magicians were again able to copy a plague (frogs) but weren't able to reverse it. Only God could do that. The third plague they couldn't even copy what was happening. They admitted it was "the finger of God." By the sixth plague the magicians couldn't even stand in front of Moses because of the boils.
God has Moses warn Pharaoh about the first two plagues but gives no warning about the third, which starts a pattern. He warns for the fourth and fifth but not the sixth, He warns for the seventh and eighth but not the ninth. He gives one last warning with the 10th final plague.
If I were an Egyptian I would be very unhappy with the Pharaoh cause they were the ones really being tortured by the plaques and having to clean up after them also.
With the seventh plague: hail, God gave a way for the people to avoid being hurt by it. There were people that began to recognize who God was and feared Him so they did as instructed and were spared from the damage.
Pharaoh's heart was hardened by God at times but there were times he hardened his own heart and influenced those around him to do the same. Chapter 9 verse 34 "But when Pharaoh saw that the rain and the hail and the thunder had ceased, he sinned yet again and hardened his heart, he and his servants. We need to be careful about letting circumstances and the people around us to cause us to harden our hearts. I have been guilty of doing it. I remember in my preteens/early teens time that after being so generous (example: giving others my lunch money so they had food and I would go without) and sweet to people and getting walked over repeatedly that my heart became hardened. I became me centered and screw the world mind set. It took its toll on me and I really didn't like who I had became. It would take years for me to really seek God and give Him what I had been holding on to for Him to melt away the hard coats on my heart.
During the sequence of the plagues you can see Moses maturing into the role God called him to do. After a few plagues, he was doing and saying things himself instead of having Aaron.