Rotaries are much easier, and every other facet of driving, too, if the driver knows where his car is on the road. Most people do not have any idea how large or where their car's "footprint" is. I would have disputed that until I finally gave in to the blandishments of a co-worker years ago and did an exercise with a simple 12 inch ruler. I carried it in the seat beside me and when coming home or parking most anywhere that I could drive up to a light pole or a wall. I would drive up to it and stop, no backing and filling, just stop, then get out and check the distance between the front bumper and the obstruction. It only took me three or 4 times doing this before I could stop every time within less than an inch of the length of the ruler. I could see the difference on the street, in fact it was glaring. I had a new and much more precise idea of just where every other car in my sight was. One effect is that I could now parallel park with fewer moves, more confidence, and less time. I can drive through much narrower spaces between obstructions, etc. I included the ruler exercise as well as map reading when I taught all four of my kids to drive. The skill is transferable to vehicles of different sizes and shapes without redoing the exercise.
Even if you are confident at the wheel try it, your perspective will change, maybe radically.
I'm a retired big truck driver and when my Filipina wife was learning to parallel park, I found the way to teach her was to use points on the car to determine WHEN to make a turn.
Once I figured that out, she parralel parks every time now with a 4" space between car and curb ... one pull up to the meter.
I'm familiar with the GOAL concept .. (Get Out And Look)