If you’re making a piece of jewelry that requires multiples of one component, make all those matching components as close as possible to being the same size.
* Mark your round nose pliers with Sharpie marker to make the same size loops every time.
* Use a popsicle (craft) sticks as a template for measuring the wire for making ear-wires, S-clasp, head/eye pins, etc. Write down the wire measurements, wire gauge (I use a pencil to write, Sharpie marker can smear). Also, you can tape a sample or trace it.