So this will most definitely not apply to everyone, and I'd appreciate respect in the comments!
I'm 22, and I've never given a guy head. When I was about 17, and getting to know a guy I liked, he kind of forced it on me, held my head there for a while and it was horrible (obviously). And ever since then, any boyfriend I've had I just had NO intention to do it, I associated with a bad feeling, taste, experience etc etc (and that's entirely reasonable, and if you want to never do it - also reasonable, something you should discuss with a SO though).
However, I kind of have been leaning towards trying it lately, of my own will, with my current partner. So as you do, you google "how to" do it, because you're terrified of being bad, and sucking (pun not intended). But all I can find is advice given to 15 year old virgins about doing it to their boyfriend who's first time it is also (supposedly). And while the advice of "how to" is not exactly bad, I feel the advice of:
Look into his eyes, moan, just grab it, lick all around, start putting it in slow and then eventually go deep blah blah blah. Is not entirely helpful to everyone. Because for anyone like me, or anyone shy and scared, but still interested, you don't have that kind of confidence nor know how (lick what? lick how... etc).
So, I have yet to fully do the act myself but I found myself being able to sit closer to it after a few weeks. Be more confident with my hands after a few weeks. And eventually start kissing further down his body, because even at the start kissing passed his neck was a bit scary. And after 2 months of being together, I kissed down to the region and I kissed his thigh and for me that was huge (again, no pun intended), and he liked it and he's been very supportive of how slow I've wanted to take that. But to do that, for me is huge and I am quite proud of myself and my inner growth.
So to those out there that think the advice, that to me, is better to the really confident girls who aren't a bit nervous in the bed still, take your time. He should understand, especially if you explain to him like I did that I'd never done it, I am interested, it may not be next week or the week after, but I'm nervous - then he should respect that. And you'll find yourself sitting your head closer, being able to look at it, kiss further down, you'll gain the confidence, because he's not pressuring you, he understands and you trust each other. And even if your first time, all you can do is kiss the top of his thigh while doing the rest with a hand, that's a good start.
And next time, maybe all I'll do is kiss the shaft, then kiss the tip. And the time after that I'll just lick it (like a lolly pop as my friend explained is a good start ha). You move into it, you don't have to just shove it on in there your first time.
To finish, I don't think the advice is bad as I said, they're giving you step by step instructions perhaps on what to do, and you can use it how you want, but usually the instructions are for very confident girls sexually, or girls that know how to do it. Because in my mind, if I'm googling "how to", I am obviously not sexually confident enough (yet) to outright ask him "oh baby tell me what you want". (Talking dirty is another whole thing that also comes with confidence and is no shame in not being able to do it properly straight away!), But I just wanted to give a perspective from someone who is nervous, who is not a virgin though, who's boyfriend is not either, and offer some more "gradual" tips that may be useful.