I have a small female ornate in my 30 long. She's my favorite fish and has been bulletproof after her break-in period. Leopard wrasse bury themselves in the sand at night and when stressed, so it is possible that yours will bury itself for the first week or so. In this time it may only come out at night, hunting for pods. There is nothing you can do during this time. Do not distrub the sandbed or you will stress it out more which is not good for the fish's health.
The reason they are considered expert only is because they do not ship well. Because of this, it is best to buy them from your LFS. I recommend giving the fish a week at your LFS before taking it home, but this is hard to do because some people may not have the patience I recommend and they might take the fish before a week is up. If the wrasse survives a week at your LFS, it is safe to take home. My LFS fortunately always has leopard wrasse in stock, so I can ask them to hold one for me for a week while I wait to see if it survives. If you do not have this luxury, you're in a tough spot.
After waiting for a week, I brought mine home and it was immediately swimming around hunting for pods (why I recommend waiting), and it immediately ate PE mysis. Although the mysis is bigger than its mouth, mine was able to get mysis down in time. I spot fed it so it could get the shrimp down without being pestered by my other fish.
All in all, I don't recommend ordering this fish online (especially from LA). Try and get one from your LFS. If this isn't possible, find someone who quarantines fsih to get one for you, and to make sure it survives before sending it your way.
Best of luck