A savvy local developer is successful because they know the system and this information is worth paying for. Sometimes the price a steak dinner and a couple of beers can get you information that will save you thousands of dollars. Some of the best advice can just be as simple as identifying the people in the planning department NOT to talk to. Public hearings can be a nasty surprise, or a strengthening for your position depending on what the neighbors think. How your neighbors think of your project is up to you to define.
People are often suspicious of strangers.
It is harder for someone to dislike you if they have shaken your hand or had dinner with you. Get out and talk to the neighbors first. This is a good idea even if you don't have to go through the public hearing process. You will be living next door to these people for a long time. Make an effort to build a positive relationship.