Enter the state of Ihram before the applicable miqat for your route. The clothing and restrictions vary by circumstance; learn them from a qualified guide before departure. Pack the items you need so they are accessible when the time comes.
Ask your group how the miqat will be announced during your journey and when to begin the Talbiyah.
For your journey
Rites can differ by Hajj type and personal circumstances. Verify religious questions with a qualified scholar and current travel requirements with official authorities.