You should be aware that your party should consist mostly of level 40
players if you're forming a party . You'll have no problem if you invite a few 35-39 players to your party, but too many and you'll have trouble taking on the final boss. You should also be concerned with the diversity of the party. A high-Heal Cleric is very highly recommended - almost essential. Also, you need a Thief with Dark Sight (Assassin or Bandit) to complete the
quest. Bowmen are very helpful on some levels but unnecessary. Warriors excel in this quest since most of the levels take place on small platforms. You need a mage with teleport also.
Put on your best equips and go from channel to channel advertising your availability if you're trying to get into a party. Don’t stay too long on each channel. Keep in mind that you'll have a much easier time getting in during weekdays, during the early afternoon and late at night. If you play in a server other than Scania or Bera also you'll have a much easier time. Once in a party, ask for your party's track. If they don't have one and you're not prepared to wait a long while, don't hesitate to leave and search for another party. If they do have a track, check it.
You need to start repeatedly checking your track Once the other
party is at stage 7. Stage 8 will probably take awhile for them to finish, but once they get into A Crack on the Wall (the boss stage), your leader needs to start clicking the stop-sign. The PQ will open only a few seconds after they leave the boss stage !