Confidence comes with experience.... experience comes with actually doing the job.
And fear leads to the dark side... but that’s another story...
your installation will be tested? So carry on and do your best. As mentioned above regarding colours.
there is an issue here with a boss that thinks it’s ok to get angry. What are we talking about here? Effing and blinding, or likely to sack you?
Not worth working for him, in my opinion.
could be a case for unfair dismissal or bullying in the workplace. (We don’t know all the details or the seriousness of his actions, so take this advice with caution)