Might I suggest you do a Youtube search on LAX-it and the process from arrival to actually getting into an Uber or Lyft. We did quite a bit of research and have decided on a Black Car service who will pick us up curbside versus waiting for a shuttle bus then waiting for your Uber/Lyft. Seems the LAX-it lot is huge and if it's busy, you may be waiting a while. I think Uberblack or a Black Car service will be the most convenient and get you to the ship quickly without hassle. Just my two cents...
Have a great trip!
Cheers,
Rob