I’ve done that. Also pretty much whacked my beard off when I thought the electric trimmer was set to to 4 and it was on 1. It grows back.

A suggestion: Your muscle memory is based on shaving with a DE. Let your beard grow out for 4 or 5 days if you can so you can see more clearly where you want to trim it and then sneak up on the profile you want with the straight.

You already know it’s going to be a different experience than with the DE, so take a little extra time. You’ll get there with practice.