Hi Kat,Mary Lou Orthey plays the Autoharp wonderfully well and she too has some .....ah..... incredible lung capacity. Assuming you are right handed sit in a straight backed chair, feet and knees about about 8" apart. Set the bottom , string anchor end , of the harp[ on your left thigh and allow the harp to fall across your left...ah.. chest. The top of the harp will be about equal to your shoulder. From this possition you should be able to see and reach all the chord bars and it should be fairly comfortable.
Don't give up too quickly, great things await the patient one.
Don