Afropony
Smash Lord
You want to use the aerial that finishes quicker (not that one that starts up first) because straight after using the aerial you want to jump or fastfall depending on which direction you have been hit.
Something I do that helps my DI is tap the Cstick when I know that I have screwed up and am going to get punished at high percents. After a while you will realize which moves your opponent is using to punish you which allows you tap the Cstick in the direction which will help coordinate you to the corner of the stage.
There are also characters that you know are going to be trying to kill you with specific moves: Snake's Utilt, D3's Utilt, Fox's Usmash Etc. since you know they are going to try and you with this moves you can SDI into the position even before your opponent has hit you.
Something I do that helps my DI is tap the Cstick when I know that I have screwed up and am going to get punished at high percents. After a while you will realize which moves your opponent is using to punish you which allows you tap the Cstick in the direction which will help coordinate you to the corner of the stage.
There are also characters that you know are going to be trying to kill you with specific moves: Snake's Utilt, D3's Utilt, Fox's Usmash Etc. since you know they are going to try and you with this moves you can SDI into the position even before your opponent has hit you.