Just keep at it Mike.
I personally think that knowing WHAT an item should look like before you make it is a real key. That way you know if you are straying from the design, quality and execution you are after, and know to stop and regroup at that point.
Also, shoot for 100% quality. You may not make it, but if you shoot for 100% and miss it by 10%, that is still a good craft. If you shoot for 50% and miss by 10%.....well.....not so much.
I think that "Well, this is good enough" is the bane of real craftsmanship. Can you hear Taylor Sapergia, Dave Crisalli, Art DeCamp or Mark Silver, say, "Well, that is good enough"? No, me either.
Best wishes, and God Bless, Marc