You folks all sound SOOO accomplished. Wow!!
I thought I would share a few ideas that I have come across. Maybe it will help a few of the newbies.
When I have a pattern that I want to keep, and it has multiple sizes and I don't want to buy more patterns, I make a separate copy of each size. I do it this way: I have a big roll of paper I got once at Costco. I tape the thin tissue pattern to the paper, and I trace over it with a permanent marker. It bleeds right through the tissue paper, and leaves enough of a mark on the paper that it is legible. Then, I use the heavy paper copy from then on, and I keep the original pattern as a Master copy only. I keep these new copies in gallon-size ziplock bags. I write the pattern number and brand and all pertinent information on each new pattern piece, of course. Personally, unless the pattern cost me only like $1.99 and I KNOW I will always be able to get another like it at that price, I ALWAYS copy my pattern, and use the copy, reserving the Master copy. I don't have to use patterns all that often, though. Copying the pattern takes a while, but you only have to do it once.
Another idea that I came across somewhere is that of using scotch tape instead of pins to attach my pattern pieces on my fabric. Everything is much smoother, and I can cut right through the tape. The tape reinforces the pattern too.