Marshall your allies early. Most people really like to be helpful, when they can. Let them know how. Ask them how they can help. Lay the groundwork properly.
Informal communication is very effective.
These are hardworking, competent, usually very helpful people. They are overworked and underpaid. Have draft ordinances and backup information in writing. Be prepared before you talk to them. Assess the opposition in the community, or within the staff or officials.