Boat Registration and Numbers

[EvinFord]

My uncle gifted my brother and I a boat. He lives in Texas and we live in Louisiana. My question is, we already changed over the title and are in the process of changing over the trailer registration, how long do we have before we have to change out the numbers on the boat? I am assuming that since we switched over the title that we are going to have to renumber the boat with LA #s?

Also, what is the best way to get the old texas registration numbers off the boat so we can put the new ones on there? Want to get them off cleanly without damaging the fiberglass.

-Jordan