Here's a (ahem) taste:
Like a lot of sex acts, there's not a lot middle ground when it comes to cunnilingus: you either like licking pussy or you don't.
Some of those trepidations aren't due so much to preference as not wanting to look the idiot when a partner is hoping for a good time. Serenading your lover with a cheap harmonica rather than with a Stradivarius, so to speak.
If you don't want to look like you're auditioning for a jug band rather than the Met, there actually are some techniques you can use to increase your confidence. Like a lot of "make yourself dynamite in bed" tricks, these are hardly guaranteed, but they may help you get over your nerves - so maybe you won't blubber your lips like an idiot on your girlfriend's labia when next you go to kiss her between the thighs.