Wiring a CU has reminded me of when I was a lad and my next door neighbour who taught electrical installation theory and practice at the town college. After he taught the theory and students put the wiring in practice for the first time, he would then go on to his 'time is money' masterclass - how to install a ceiling rose and wired pendant (say) in the most efficient way yet still achieving a neat outcome. What length conductors, how much insulation to strip back, labelling, order of connection, which way to bend conductors and finally final checks on terminal tightness. The idea being to have as few steps including number of tool changes as possible. Time and motion if you like. At the end of the course there was a keenly contested competition for each of the common wiring jobs. Interestingly, every so often one of the students found a simpler and/or quicker way which became the latest best way. Paid dividends to those who followed the examples and then had to do high volume 'price' wiring jobs. The idea being to create dexterity from muscle-memory through repetition.
He also encouraged ambidextrousness.
As ever , practice makes for perfection.