Second the out in the weather- not just weather but dirt, sand, ect.
Yesterday a really cool and particular tradesman posted another siding link "This is Painful" yesterday.
Nothing ruins a nice job than using tools that don't do the job properly. Years ago I was in Flordida running siding with a brake permanently mounted to the side of the trailer. Remober, I said in Florida where the hinge (cringe) was crushing samd and droppoing same into the aluminum marking it up.
Never again will I have a brake outside in the weather. I like the trailer idea but too hot in the summmer to be in a trailer. I like to be set up in the garage with a table on one side to hold and layout the coil, cut with a carpenter square.
You know you are doing right when you side a house, wrap the facia, casings, beams and the scrap coil is not enough to fill a trim coil box- half way you are doing it right.