Yeah but hey whats he gunna do to practice DI and Ledge Techs? Sounds like something you might practice in friendlies. Though I personally cant think of how to practice DI.
DI practice.
Training mode,pick Fox.
put CPU on human and damage to 50%
Have Fox charge an F-smash,during that time,keep holding A then reach for the other controler then hold away from Fox(Left or Right) to ASDI.Or,you can smash Left/Right to Smash DI,and you can even try multiple Smash DI.
Or you can have Fox U-throw you,then ASDI left or right with other control.
Teching Practice.
Training mode,Pick anyone.
Put items on Motion sensor bomb.
Take a bomb and put it near the edge.
Jump off and try to recover,as you recover hit L alittle early,then when you get hit by the bomb,Smash DI Right or Up/Right(Diagonal) to wall jump.The bomb will detonate when you are near it.
That's how I practice.