Observing
As a visual person, I find it really important to observe and listen rather than read about how something is done. My biggest go-to is Youtube or a hands on workshop where I can see the spatial relationships. I find it important to see where the instructor is clicking or exactly how someone is mixing a resin mold.
Typically, I observe something three or more time before I attempt it.
Repeating over weeks
It's not enough to remember how to do something that day. Usually, I won't be an expert in something until I've achieved a result over several weeks, allowing time to pass between tries. Once it's logged in my long term memory, I can begin to let go of rewatching instruction videos and I can stop referencing notes.
Making it your own
An important step in achieving proficiency in something, is to be able to make something my own, to add a variation to something that has previously been simply a copy of what the instructor has made before.
Being able to teach it
Once a skill has been perfected and the ability to create variations of it have been developed, a great way to keep honing that skills is, for me, teaching it to others. When you have to teach something, you have no choice but to get to the nitty gritty details, surprising even yourself at what you may have missed as a student.