Type 9 pilot here and I've done all my trading in open and still do. I only did one trade run in solo when I just got the T9 so I could get a feel for how it flies and how to dock it.
I've had many close calls with player pirates and psychos (IMO, a CMDR is a possible psycho if they have a large bounty on their head and have a FSD interdictor) but none of them have successfully interdicted me. I could write a wall of text on how I avoid pirates and psychos but to make it short: be aware of your surroundings, observe their actions and movements since they might not be after you, use evasive maneuvers if needed.
I've had many close calls with player pirates and psychos (IMO, a CMDR is a possible psycho if they have a large bounty on their head and have a FSD interdictor) but none of them have successfully interdicted me. I could write a wall of text on how I avoid pirates and psychos but to make it short: be aware of your surroundings, observe their actions and movements since they might not be after you, use evasive maneuvers if needed.