Again, if you do get 'stuck', remember the help section on xeptatlssword.com will give clues to help you as we tried to anticipate most of the problems players might encounter.
Another point worth stressing is that (as in many mission OXPs) some parts must be completed 'properly' to allow the mission to continue. This time you will be OK, but generally I would strongly advise against using features/weapons/equipment provided by other OXPs as these may cause you to break elements of the mission, or even miss vital parts of the mission altogether.
Xeptatl's Sword was designed to be enjoyed by everybody, including those flying a standard ship with few or no other OXPs. If you have many other OXPs installed, that's fine, but try not to rely on them or their features while doing the mission.
