It seems to me that asking permission this year is almost like my job. I have knocked on hundreds of doors in 3 states and over a dozen counties. Here's what I have learned:
1. Get used to hearing the word "NO". I have found that maybe one out of every 20 houses or so give permission. Knock on A LOT of doors.
2. Buy a plat book. This lists property boundries and names of the people who own them. This helps in deciding who owns what. It is also helpfull when you can go up to the farmer and call him by NAME. It makes you look as if you have done your homework.
3. I would wait until a warm spring day to ask. Right now, farmers have fresh memories of the past season-some may not be good. If you ask in the spring for permission in the fall, it may help. Another thing-who is gonna want to stand there with the door open when it's 20 degrees outside?? It's enough that you have to inconvenience the farmer-at least do it when it's warm.
4. Dress nice; don't go at dinner time.
5. No matter what-offer to help with work on the farm. If he says no at first, offer a few days labor in exchange.
6. Try different angles. Talk to his neighbors. Find out what he is like. Perhaps he would grant you permission to hunt squirrels instead of deer. Accept this, and then BS with him every chance you get. Once he gets to know you maybe he'll let you hunt other critters.
7. Be persistant. If he says no one year, stop back and ask the next. Sometimes if you ask for late season (post gun) they will grant it. Maybe even drop him a Christmas card if it seems like it may help.
Sorry so long, hopefully other people will benefit from my experiences. Some farmers will just say no, no matter what. Others let everyone hunt. The most common reasons for denial are " I used to let people, and they littered, etc." and "Sorry-I've already got people hunting." Find a way around those, and you're in!
By the way, if anyone has anything to add to this, let me know. I'm always looking to improve my odds.