First time OBer asking for advice on registering a trailer in La.

Hi y'all! I'm not much of an hunter or a fisherman (I'm fat, lazy, and like to sleep late) so I never really looked at this board much but then I found out that there is a lot of good info here about landscaping and lawn care so I find myself lurking here more and more.

I have a question for Louisiana sportsmen. I recently purchased an older boat and trailer off of craigslist from someone in Mobile, Alabama. The trailer has no registration and no serial numbers. I want to register it in Louisiana but all I have is a Notarized Bill of Sale. I have been told that the State Police will stamp numbers on the trailer but I have also heard horror stories too.

Have any of y'all had this experience and does anyone have suggestios as to how to get this trailer registered in Louisiana as cheaply and painleessly as possible?

Thanks in advance.