Ihram at the miqat
Learn the steps before you travel, and know which miqat is on your route. The Prophet ﷺ set Dhul Hulayfah, al-Juhfah, Qarn al-Manazil and Yalamlam as the miqats for those who come from the different directions. Many people who travel by plane put on ihram clothes before boarding, then make the intention when the plane reaches the miqat. The crew usually announces it.
Ihram is the state of dress and intention that you enter for Umrah. You must enter it at or before the miqat, which is the boundary point set for your route. Take a bath, clean yourself and wear your ihram clothes.
Men wear two pieces of unsewn cloth. Women wear modest clothes and avoid the face veil (niqab) and gloves while in ihram. Most scholars allow a woman to let her head cover hang over her face when unrelated men are near, as long as it does not rest on her face.
Then make the intention for Umrah in your heart and say the talbiyah: Labbayk Allahumma labbayk, labbayka la sharika laka labbayk, innal-hamda wan-ni'mata laka wal-mulk, la sharika lak. It means: Here I am, O Allah, here I am. Here I am, You have no partner, here I am. Truly all praise, favour and sovereignty belong to You. You have no partner. Men say it aloud, and women say it quietly. Keep repeating it until you begin tawaf.