Thanks for letting us know it's going to be ok :-)
Sometimes the issue can be pretty simple but hard to see when it's your own.
One rule about the lack of auto-index - NEVER turn the shellplate backwards. Just make that a rule/reflex.
Next rule is to pay attention and if something nags at you like maybe you're pulling the handle twice, CHECK IT.
If I get interrupted for something, I'll finish the rounds on the press and clear the shellplate so that I return to a known re-starting point (empty press).