After removing screws and the cylinder, hold the pistol in your hand and smack the lower frame (grip) area with the wooden handle of a mallet. The idea is to cause the frame to pop away from the side plate. Don’t pry! It is a very finely fitted piece and has very sharp edges. There are some YouTube vids that show the technique.

Edit: Long vid here but this guy is great! Different technique than I use but he knows his stuff. https://youtu.be/4ujyLn3lHBc