I agree with MinnDasota. Few places have 'true' direct access so you will surely have something to talk about with your representatives.
I have both called and met with legislators personally--it is a great thing to do, and usually takes less than 5 minutes. Most reps. are pretty easy going because they want constituent input.
My advice is to pull together a few talking points about the issue and think about any personal examples to support your case if you have the opportunity. I have tied in how issues have either impacted my family personally or patients.
Best wishes!!