Here is how I can best describe it. As you enter into Berlin center, you will go left at the Fraternal Order of the Eagles (Main St. goes straight). Passing the Berlin City Bank on the right, you'll come to a stop light with Dunkin' Donuts on the left (with the world's worst customer service....).
Go straight through the lights, pass an Irving gas station on the right (usually remarkably cheap gas). Pass under a railroad bridge, pass the Police Department on the left, and get to a T. The traffic flow will basically force you right, and follow that. Take your 2nd left (where 110 starts. I have never not seen the sign, and I've been going up there about once a month for 15 years).
Follow for a block, come to a stop sign, and go right. You should be staring right at the cliffs on Mt. Forist (or as the locals call it, Elephant Mtn. for obvious reasons) From here, you're basically out of the city and smooth sailing from there.
There are two opportunities to mess up. The first is in the center of Berlin. If you end up on Main St., this will take you up Rte.16. No real reason to panic, as you can still take Milan Hill Rd. or Rte. 110-B, which take you to Rte. 110 about three miles north of the Hatchery Rd. These are both 10+ miles outside of the city.
The second is the left where 110 starts. If you miss that one, you'll come to the hockey rink on the right. You went too far, turn around and back track about 100 yards and you'll see the sign. The problem with the sign is that it is close to a building and tough to see from where you will be coming from. It is more visible when backtracking.