If it is difficult too, it probably is smaller than you need. If you keep the glove, I would soak it in cold water then try it on and if it is comfortable, shoot with it wet. Wear it for awhile, or stuff paper inside, and when it is wet replace the paper. You'll need to do this several times to soak up the excess water. Repeat the process of soaking, shooting and paper until they are comfortable. Next add a little Montana Pitch Blend Leather Conditioner.
DO NOT dry the leather near heat, it will either get hard or shrink.
2nd option is to call and see if it can be returned for a larger glove size. You might order the extra long stalls, because with the inserts on my glove, the string groove is almost too far back.
Next time, I will order the longer finger stalls.
If you end up with a glove that is too big, add a thin piece of calf skin, (goat would work)inside along the top, and glue in place with Barge Cement., or tighten up the stitching on top with waxed stitching thread.