When I'm working on a piece of glass art, I will always re-cut pieces if I'm not 100% happy with the initial colour I've selected.
It'll take longer, of course - but if it's wrong it's just wrong 😄
You can see here that the initial red glass I'd chosen was too dark. I recut the piece from a sheet of Cherry Waterglass, which worked perfectly.
I'm checking the fit of the pieces in this video, by placing them on a wooden board and using the silver push pins to hold them in place.
For the stained glass people - I'm using Silberschnitt running pliers to break the curves. Expensive but the best at doing their job!!