1) don't assume anything about Genghis' qualifications, or that of any other "PPL". I am not an ETPS (or equivalent) graduate, but I have had approved and recognised training in flight test techniques. This has nothing to do with any of my other aviation qualifications. Genghis knows a great deal about flight testing, and likely a fair bit more than most on this forum, myself included.
2) anyone with any sense of professionalism will take time to read and know the manuals for an aircraft before flying one for the first time. Especially if you're planning to carry out any kind of flight assessment. Yes, most simple SEP types will tolerate being handled in the same way, but to really understand what to look for, interesting behaviours, operating limitations and guidelines, you have to go to the books.