>>298364Oh my god, not the parallel parking again *slams head on desk*
(just kidding)
1. I don't use the 45 degree turn method, it's more of a continuous turn for me. You drive on the left side in India, right? So when backing up, I would look in the right mirror and compare the right side of my car with the right side of the car behind me. They should be roughly in line. The goal is to get the butt of my car up the other car's nose. It's fine to adjust the wheels left and right as much as you need, it does not have to be a perfect three-move maneuver. As for the curb, to be honest I just back up very slowly and feel for any resistance. But my private car is a shitbox and a little scratch on the rim won't damage my soul.
2. It's mostly experience and memory. Once I'm done parking, I usually get out and take a look at how much distance there is left, and compare that with what I saw through the rear window while I was backing up. By the way, I don't limit myself to just the side mirror, I use everything I got - mirrors AND turning around to look behind.
3. In these situations, I turn the blinker on and slowly shift towards the lane I want to change to. If I don't see the car behind me slow down to let me in, I back off. I only change the lane when the car behind me is well away. But where I live, the traffic is lax enough, and the drivers are nice enough for this to work. It might not be the case with angry tuktuk drivers.
4. There should be at least 1,5 car's length between the cars. Sometimes I judge wrong and embarrass myself by trying to fit in a spot that's too small. Oh well, I'm too old to feel shame because of such trivialities.