I’ve done it more than once. Couple of very important things
1. ***You must bring with you the forms from Texas W&F for seller to sign for incoming from out of state. For some reason, I think the form #’s are 143 and 144.
2. You also need to get him to sign his Louisiana boat registration over to you. I think there is a spot on the back just like a title. At the least get his registration paper for the boat.
3. Get his Louisiana trailer title.
I have never notarized any of my transactions, but it isn’t a big deal if that is something he wants. They are everywhere and cheap.