Make sure she’s warmed up before, plenty of kissing, playing with her breasts, gently rubbing her clit etc.
Kiss down her body and take your time, tease her and don’t just go straight into it.
Make sure your tongue is wet! Sounds self explanatory but there’s nothing worse than a dry tongue 😂 If her pussy is pretty tell her that, if she tastes wonderful let her know.
I don’t like a lot of pressure, so starting out light is best and then you can always lick harder if she asks for it. Take your signals from her and listen out for what she’s enjoying.
Lick her clit slowly at first and then build up the pressure/speed as she becomes more into it. Some women like fingers too. Let her know if you’re enjoying it. Light sucking on the clit is great too. Basically, try a few different things until you figure out what she likes and then keep doing it.
Some women like some anal play too like rimming, a finger etc but don’t try any of that without asking her first.
Enjoy it!