I have to agree with this thought. I wouldn't buy ANYTHING until you have watched all those videos and done some research. What will happen is that Ryan (BRStv) will say something about a particular piece of equipment, or process, that will make you think, "Hmmm...if I do that, then how do I accomplish (whatever)?" Then you'll go off in search of the answer to that question.
Can you hang a heater and a skimmer on a tank, add some rock and fish, and have a great tank? Yes! But the truth appears to be, the simpler you make it, the harder it is. For every dollar you save in automation, you add minutes (or hours) of work. You can, for instance, automate water changes. If you do that, you have to spend money. If you don't, you have to spend time. If you do not spend the money AND you do not spend the time...your tank will suffer.
I do not believe anyone here wants to discourage you from entering the hobby. But I do think they want to encourage you to do a lot of research before you start spending money.
I can tell you that I have bought a few things and then found that I needed something bigger or more powerful, and bought the same thing again. Fortunately I also have a 75g...so anything that won't work on my 180 gets moved over to the 75. But the question is...can you drop $200, find that you bought the wrong thing, and turn around and drop $300 to buy a bigger version...without killing your wallet? If the answer is no....read...a lot! Before you start buying things.