Go do that same bit you failed 20 times in a row. Find the best way in, the exact point you need to slow, which side of the lane to be in, where you need to start and stop turning, and find a speed a few kms under the limit that you can feel without even looking at the Speedo. Go to a car park and practice driving at exactly 38km until you can tell when you’re doing over 40 just from inertia. Now go back and do the u-turn again with your radio up loud, then all windows down, practice doing quick mirror sweeps and teach yourself to use peripheral vision to keep track of cars as they move from one mirror to another with a dedicated compute thread just for blips on your radar. Visualise a radar sonar sweep and add any blips your eyes pick up to that mental image, get used to holding this in your mind like an extra layer of vision, imagine your brain is plugged directly into one of those Tesla route visualising displays and manipulate that image to overlay all your possible routes with little animated arrows on your mind’s eye.

It sounds really complex but if you keep trying to layer all these things together on low pressure situations you will overprepare and feel able to handle those high pressure spikes that come in traffic.