I liked the FR10 trial, but my review says I set it up. The demonstrator fitted the fingers, prepared the puck tray and loaded the job before I arrived. I started the saved run and changed a tray with help. My wording gave me quite a promotion. I'd like to correct it without pretending I disliked the experience.
Keep the positive impression and name the work you actually did. Separate what you observed, what you operated and what the demonstrator prepared. Which parts of the interface felt clear to you, and where did you need help?
Did your timing start when you arrived? If the review gives a setup duration, the reader needs to know whether the demonstrator's earlier work is excluded. You can leave that duration unknown if you did not observe it.
That avoids an estimate your evidence cannot support. I'd keep the limitation about interruptions visible as well, since a reader deciding on a workshop trial may want to investigate that next.
Fair correction. A useful follow-up would be whether the written tray-change instructions make sense without those hints, not a second claim to have commissioned it yourself.