A few people in my neighborhood have fences/walls. Most are those incredibly ugly white plastic things. I know where my corner markers are. I try not to put stuff beyond my boundary, but it generally doesn't really make a difference as three sides of my property is wooded/wild, and I'm probably the only person to go in there. The town "owns" 10' on either side of the road in front, so I try not to put much there except for my mailbox and a couple of small flower patches. Note: Kids do not recognize boundaries. They will ride their bikes on my driveway, across my yard, wherever they feel like it. Smart people, those kids.
If their estimate is always shorter than yours, they can easily accuse you of sandbagging to meet your estimate.
A lot of bosses do that I think. They accept your estimates but internally they expect you to always be under the estimate. Accusations of laziness fly eventually if you are over estimate, or even meet your estimates consistently.
Risky. I've had a bad experience with a manager that on a similar opportunity set his own deadline and used that to put pressure on the team completely ignoring anything the team said. At the end his version was the team didn't deliver, not one bit that he was wrong. That mofo. I'm still bitter about it.
The best times were back in the early '90s when we were just five guys coding and playing music and smoking bongs and playing Quake after hours and maybe getting paid this month. By the dotcom implosion and 9/11, we had an award winning retail product, the first single-shopping cart online mall, 70+ employees, and we'd moved from the old house through several iterations of office spaces. But a bunch of yahoos from Montreal had bought us, and brought everything crashing down. The old days are calling.