1. Get a very cheap guitar with nylon strings
2. Tune it to a major chord
3. Learn to barre, that is, hold down all the strings with one finger.
4. Play twelve-bar blues, just the chords, until sick.
6. When unable to bear any more, look for ways to change it up.
Edit: Look, here's the reasoning. First, the cheap guitar is not intimidating. The strings are soft. The tension is low. It isn't heavy, you can pick it up easily. It isn't valuable, so you can throw it down in disgust. Second, by playing something completely braindead, you get lots of basics sorted out about ergonomics and how hard to press the strings and how to strum and general confidence. Thirdly, because you're playing an actual tune right from the start, it's rewarding, and when the reward wears off you already have a base to work from which can be improved in small ways to seek further reward.
Incremental ways, in fact, which is a possible alternative to the word "deliberate".
It may also be the context, I play original, improvisational music with people/in front of an audience and YouTube may be particularly bad at preparing people for this.
You can see sometimes course authors acknowledging these metrics. Companies training departments just wash their hands and say, we have these thousands of courses made available for our employees... :-)
Of course people who learn at home on their own will, on average, be worse than people going out and playing with other musicians. That would likely be even more true if they bought a VHS tape with lessons, or book with a CD.
I would consider a teacher important enough that I would borrow/rent an instrument to try out teachers and only after you find a teacher you like buy. It is typically better to play an instrument you have never heard of before taught by a teacher you "click" with than buy the instrument you think you want but not find a good teacher.
That said, online lessons are great supplements to your teacher. And if you are broke (between jobs) often cheap. Sometimes online lessons can teach you things that your local teacher cannot (as opposed to will not because you are not ready). However the local teacher will also correct things that you will lie to yourself about.
Find a teacher that can play the stuff you want to eventually play. Then take some lessons and assess whether you enjoy the process of working with them. Learning scales and doing exercises to get better will feel like a grind no matter what. A good teacher will give you enough variety to stimulate growth and make you have an appetite for the process of improvement.
Edit: meant to mention that buying a used guitar is a great way to save money, too. You can buy from Guitar Center's used section and have a 45 day return period. If you live near a store, you can just take it back there, as well. If you're not sure how to assess the instrument, you can buy something from there, take it to a guitar tech and have them check it out/set it up to make sure it's ok.