One of the things I did was to break down the job into as many parts as I could easily do. Then I kept track of sketching and drawing, material, cutting, forge time, fit up, weld, finish prep, paint, overhead & the Governor. I figured out I loose more on final prep and paint. So... I quit painting! Told a customer what the price was without paint, he said he didn't want to get another bid for painting. So, I told him to let the painter forge it. He said the painter doesn't forge, to which I replied "and I don't paint"
OK, that sounded funny, but, I did paint the job, but I learned that I am slower at painting and would rather give that part away, I also bid paint higher now or send it out for bids myself. Learn your weaknesses, get faster. Don't sell yourself short, for everyone who does makes it harder for the rest of us to make money off our work. We all are in this together ( Part time & full)