About as difficult as getting anything that is incredibly rare.
Well the real deal is it is easy to get any cue maker to make you a cue.
The more you are willing to pay the faster you get one.
I have seen lots of "experts" here say, this cue maker isn't taking orders, or there is a long wait. Shortly afterwards I have had friends that knew the cue maker or paid an extra amount and got cues almost immediately.
The long waiting lists are for suckers.
Ken