Can you hide your face from a facehugger? – scifi.stackexchange.com

Facehuggers have a variety of ways of giving you a face full of alien wing-wong.

As we see in most movies, the prefer to attack by surprise, are extremely fast and are capable of very long jumps, leaving you with no time to turn away.

They also seem to strike the neck of their victim (as seen in Aliens and AVP), throttling them into near unconsciousness before settling onto the face of their victim.

As we see in Alien they are also capable of secreting acid capable of melting through a very thick looking space helmet, so covering your face with your arms might not be a good idea.

In some of the expanded universe material, such as Earth War, one character remarks that he's even seen facehuggers take down adult lions.