My experience with this is that I very rarely meet a girl that catches my eye right away. And because there were not any and I was a big noob, I used to approach any girl I saw that seemed.. approachable and the elders here are right, I did not feel any pressure at all. But what it also did was amplify it when I finally met a girl who I really liked. You might say the issue is that I do not meet many girls that are certain level in looks, which is true. Also, yes, it gets you used to talking to strangers and you can try many things because you are not afraid to lose her but I always feel slight ingenuity on my part whenever it went too far with a girl like that because I did not like her that much. And then she hinted me how her roommate is out of town and that she will watch X movie after our date ends. And I was conflicted because I was not attracted to her, maybe not at all, and she gave me a big signal to isolate her.
So I would say - approach anyways, form up a goal before you walk up to her like get her number and be aware that you might feel more pressure when you finally approach a girl you find very attractive (because at one point, your brain will go on alert and be like "special case, *bim bim* special case - treat with causion") but hopefully at that point you will have enough field experience that your trained composure on the less attractive girls kicks in and you will seduce her anyways.
Think about this like lifting - if your skills are not there yet (maybe they are, I dont know, only you know) approaching less attractive girls where you do not feel much pressure is like lifting a weight that you can lift for 12-15 reps. And approaching some very beautiful and sexy girl might feel like trying to move a weight that you can lift only once. You lift that, get her number, but then your strength is exhausted so you need to wait for 6 minutes before you attempt that again. But she gives 2 minutes (or just 15 seconds) and you just cannot lift that at that time.
You might think it's bullshit to do something you dont feel like doing for hopes that one day you meet your unicorn girl and get her but it is like being 5 years in a law school, 3 years in a law firm until you finally get to do what you want to do and be in a court and try to put some criminal away. That's just life. That being said, it does not mean you cannot seduce your unicorn girl today or tomorrow. You can. But you will have higher chance if you train a bit.