My testimony from before I knew anything about rapid inductions, hypnosis, much less any experience with the sort. It still worked flawlessly. (But only because I did what was needed without knowing it.) So yes, it's easy and anyone can do it. But the more technique you use, the more effective it'll be and the less you'll fail.
Do I think it's possible to walk up to a stranger, without building ANY rapport and successfully perform an induction? I think it's POSSIBLE, but not likely. While I believe that some of the videos of strangers being put into trance within seconds of meeting, are legitimate, it's also a little misleading. Because within the few seconds of the approach, a skilled hypnotist knows how to build rapport by simply using body language, mirroring the subject, using the correct tonality, and with just a few words, can build sufficient rapport/trust to successfully induce trance.
Years ago in my 20's, before I had even a basic appreciation for hypnosis, I successfully performed a handshake pattern interrupt on a female I had just met, but I didn't realize it's significance at the time. I had been studying NLP, embedded commands, and building rapport, specifically focused on the art of pickup, to improve my approach with the ladies. I had read that by doing a handshake pattern interrupt, I could issue a command after the interrupt/creating of focus on the hand and it would simply be done. It worked, but I didn't know what I was doing at the time.
So here's what happened. (I'll try to make it brief)
I stopped at a private hotdog stand/sandwich shop by the road, ordered a hotdog from this cute cashier and proceeded to joke and flirt as I waited. We hit it off like crazy, she took a break after I ate and we stood around talking and laughing for a few minutes. One of my new learned "techniques" was to end the conversation while it was great and so there was my handshake opportunity. I told her I should get going, it was really nice meeting her, stuck out my hand and right before our hands touched, I interrupted it with my other hand, brought it up to her eye level and said to focus on the palm of her hand. I said as it gets closer, your eyes begin to lose focus. Then I simply said, "Go make me a sandwich". (I cringe at the way I did this, but it's how it happened.) She immediately turned around, walked into the kitchen and came back with a tuna sandwich. (I don't know why tuna, because I didn't give any details, I just said go make me a sandwich and she did. She had no expression, no question, no hesitation, just went and did it.) I said thank you so much, and we continued to chat it up while I ate. I was excited and in some way, in shock that what I just did, worked and just kept on with the chatting/flirting. We actually dated for a couple months. She never mentioned it and neither did I.
Now... One could argue that she would have made the sandwich regardless, but if you were there and saw it unfold, I believe you'd undoubtedly appreciate the induction and instant following of the command.
The reason I believe it worked so well, even without knowing what I was doing at the time, is because I had built tremendous rapport before the induction. Not only was there already a genuine connection between us, I was also exercising techniques of mirroring her body language, matching her breathing etc. She was already like putty in my hands. I just didn't really know what I was doing with the induction, or even that it was hypnosis at all.
That's my testimony and I hope that it will help in some way. I'm no expert, forever learning.