When they think little nips are pleasurable, or when teeth are cleverly employed as part of the friction element, that's when a newbie needs guidance. Mammals, just by definition, are natural suckers however, and it's not something that requires lessons to get right.
On the other hand the girl who blew me in a hotel room in London did have her info wrong. She would inhale, purse her lips and exhale in a whoosh onto my puzzled dick, again, and again, until the blowjob was over. Over because my willy had withered and I wasn't into suppressing guffaws for much longer.
Much much later (months) she recriminated me, "You knew that wasn't the right way, but you didn't SAY anything..." By that time she knew what a strange misnomer "blowjob" is, and could suck like a trooper, but she was still really really miffed I let her do it for so long, inhale, whoosh, inhale, whoosh...