Know the issue and the status of the legislation. Refer to the legislation by number. Know your legislator. Past votes on similar legislation as well as legislative and personal interests can help you tailor your arguments. This is where your state organization can be particularly helpful.
Legislators are very busy.
Be specific and practical. Relate arguments to situations in the legislator s home district. Keep the door open for further discussion even if you don't agree at this time. Talk with legislators even if their positions are opposite yours. Think of yourself as a consultant to a legislator.