It's pretty simple. If the original owner isn't available to go with you then have them fill out the title to the boat and motor. You'll also want to have them give you a bill of sale. In that BOS, separate the dollar amount for the boat, motor and trailer. You pay $2500 for the boat then break it down how ever you want, $1200 boat, $1050 motor, $250 trailer. Get his registration paperwork for the trailer also. Make sure that the seller is the titled person for the boat and motor. Don't let them try to tell you that you don't need titles for motors either. TPWD will ask for it. Call your local office and they'll tell you exactly what you need to do and what forms they require.