My Humidifier was leaking and not really working properly anyway as the humidity in my house had dropped a lot this year, so I decided to replace it myself. It actually wasn't that hard. just follow some instructions and away you go.
This is a huge help in my house.
Aprilaire Humidifier: https://amzn.to/3s2NiVF
Humidifier Install Kit: https://amzn.to/33ykta5
sheet metal snips: https://amzn.to/3uYb9Yb
Foam tape: https://amzn.to/3BxrTH7