Fieldsport in Traverse City, MI has instruction and fitting. Not sure how close you are to them. http://www.fieldsportltd.com/

Might as well get the basics down with instruction. Improvement comes faster that way. Recall a new shooter getting some help from the regulars. He had been out a few times before anyone asked him to do an exercise to determine master eye. He is right handed with left dominant eye. Could have progressed faster if the guys had checked that first. An instructor would have got that right away, I would hope.