"Doing policymaker's work for them" is something like 80% of lobbying.
If you have something you want done in your town, and you come with the work done AND not asking for funding, you're likely to get it.
If you come with the work done and a PLAN for getting the funding, you also have a good chance of success.
This works at the office too.
Unfortunately, most of the political changes that I want to see go against some special interest. Examples include liberalizing professional licensing, reducing medical paternalism, and streamlining the litigation system. I can think of a zillion ways to do this, but every one of them cuts out some toll booth with concentrated benefits and diffuse costs, and our political system is not capable of dealing with such things in a reasonable way.
I am very open to be told strategies to fight this more effectively without becoming a full time career activist for years on end for one issue at a time.