RE: proper trim
Thats the idea. But, you do need to remember that it is a small aircraft, so it is very susceptible to winds. So, it will be very hard for you to accurately tell how to set the elevator angle. The plane needs your input to keep it flying how you want. This is why I say that you can't rely on how the plane glides by itself. But, in the end, you might want to find a local flying field, take your plane out there and ask them if they could help you set it up properly. I couldn't imagine anyone not willing to or excited about breaking in a new plane.