Calvin's "The Necessity of Reforming the Church" is important to read and understand also, I think. A sense of urgency is proper, it seems to me, as well as the need to be as gentle as possible in bringing these things to the people. After all, why make changes if these things are simply a matter of preference? But if these things are a matter of sinning or not sinning before God, then they should be changed yesterday. Rightly understanding the issues will produce the fear of the Lord, and that fear will be conveyed to those you speak with. Above all, pray: the Lord must work!
I would also recommend the encouraging and eye-opening book "Gradual Reformation Intolerable," by C. Matthew McMahon; it is probably more accessible than, and it expounds on, the principles found in Calvin's writing mentioned above. Dr. McMahon says that the purpose of his book is to be theologically practical; to "take the biblical principles of reformation, which were the practical out workings of the theology behind the word of God, and apply them to the contemporary church."