As a retired Primary Care Physician I would recommend starting with a Physical Therapist, particularly one with experience in Occupational Medicine. The major health risk here would be blowing your back out. Even if you don’t do serious structural damage to your back such rupture a disc, you could do soft tissue muscle damage to the back that will cause painful spasms and limit you. Strength training alone won’t do it. Gyms are filled with muscle bound studs with chronic back pain. Stretching exercises for your back and proper lifting techniques are more important. I would also suggest using whatever equipment is available or that therapist may recommended to help lifting . Lifting a 109 pound amp from the floor and carrying it might look impressive to onlookers and boost your ego but I foresee a lifetime of misery with back pain unless you take precautions
