Lilith is free-spirited to the max, prizing independence (psychic, financial, whatever) beyond all else.
When Lilith is located in the 1st house of a natal chart, she is strongly connected to one’s physical self, both the body and the mind. In case that she is conjuncting the Ascendant, the native will be becoming an object of desire for other people due to sexuality. Lilith in the first house can give a very hot body, and especially in a woman’s chart can make her so attractive that other people can become obsessed with her figure. Also, Lilith placed here may indicate bad relations with the female’s father. He can be of a violent nature, and the chart owner will frequently reproduce patterns of violent explosions in her own life.
In addition, the presence of Black Moon Lilith in the first house can give a tendency to wear black for protection. The individual desires to look extraordinary and differ from the rest of the community.
Moreover, Lilith in the first house can also give a rather provocative character. The person can act “bitchy”, and indulge in mind games and manipulations. These people do not seem to be discouraged when not being liked by others. They use enemies to create an even more strong and eccentric persona, frequently making their appearance and behavior be gossiped by the society. They take pride when other people notice them and discuss them, even if it is in a negative way.
As the 1st house is associated how a person takes care of his body, Lilith will brings her magic through a lot of exercises and makes a person very responsible in usage of one power sources, turning the native into a very spiritual being.
Lilith can give a person a lot of personal demons, making him or her think too much of existential questions and dilemmas. Lilith can bring tendencies of self-abuse. When in a water sign or negatively aspected to Neptune, a first House Lilith can give addiction to drugs.
Taming powers of Lilith can grant a person a fruitful life of sexuality. In any case, a person can seduce others easily even if he or she does not understand the mechanism behind such phenomena.
If you have Lilith in a first house, you should never hold feelings of revenge, as it will backfire at you. You need to protect yourself from self-destruction. You should know that you (and your energy and magnetism) are easily noticed by others; thus, there is no real need of over-exaggerating in your appearance and behavior. Keep away from trouble! or people who bring negative emotions in your life. Yes, this produces adrenalin and then it may be a source of destruction.
(Source – Lilith if a First house – http://freespiritedmind.com/blog/lilith-in-the-1st-house/)