Yes, it is possible but not with any great accuracy. It is not clear what you mean by "it goes nose up". If you mean that at high throttle it noses up but when at a lower throttle setting or glide it acts normal, then it could be that you need to adjust the thrust lineneeding more downthrust. If you can trim it out at cruising speed (about half throttle) then cut the throttle. If the nose drops a bit and it enters a nice glide, your incidence is fine. If it drops the nose and then pitches up as it gains speed in the dive, you may have to much incidence. The best way to tell is to have one of the more experienced flyers at your field trim it out for you. He should be able to give you a clue as to whether to check CG, incidence, thrust line or???. If you have ailerons on it, one trick that often helps is to have both ailerons slightly up when the ailerons are centered. I've seen this trick often make a trainer much more pleasant to fly.