I remember back in 5 people used to have issues with Akira's Knee and Jacky's FSK lol. Good times. Tbh, the inputs for DOA aren't as complex as say KOF but there are some complicated ones of course like Hayate's Raijin. Not much that can be done but just keep practicing till it becomes muscle memory. Do the moves in training mode, then practice it on a CPU, then go online.