Will your surveyor be doing the seatrial? If that's not the plan, you should try to make that happen - as a first time boat owner you probably won't have a lot of insight as to what to look for in a seatrial, or how to recognize positive versus not-satisfactory behavior. Frankly I personally see the seatrial as somewhat of a formality as the important elements of evaluating a boat are accomplished in the marine and engine surveys.
The seatrial largely provides confirmation that gear that looks and has tested as operable does in fact work, which it usually does,
Do you have good surveys on the boat and engine...