Welcome to the forums from SW Idaho.
If I may suggest go to the forums Library and print out a couple of PDI checklists, two of you fill one out and then cross check the two.
Do NOT be afraid to ask any questions or to make them repeat something you may not have understood.
Make them show you how everything works, sofa bed set up.
Test everything till you are happy it works, micro wave a cup of water or a bag of pop corn to make sure it works.
Have then show you the water heater bypass valves and the water filter if your unit comes with one.