If you have a large 8-9” pie you will want to slice it into about 6 to 8 pieces. You want to use either a sharp knife or a serrated knife, just depending on the type of pie. Like when cutting a cake, you can have a clean towel or paper towel nearby to clean the knife. You can also have a tall glass nearby with a bit of water in it for a very clean knife. Dip your knife into the water and wipe with the cloth between each cut. Then use a pie or cake server (or spoon) to remove each piece.