I'm not sure any would be easy, but some would offer easier clues to go by.
The body shapes and comb/wattle issue are more notable on exam and can often be adjusted by breeding to a bird with strong positives where the other bird lacks.
Feathering is much more difficult in my opinion, primarily when there is a pattern involved, not so much if just trying to correct for being too fluffy around the legs or too much puff near the tail. Color and patterns involve many genetic factors and recessive genes can be very hard to weed out or even be uncovered as a culprit without many generations of genetic info known. Some birds have base silver instead of gold? But aren't silver or gold colored...yet those base genes can greatly impact the coloration of offspring. I get overwhelmed very quickly when feather genetics become an issue.
I try to breed to standard as far as good body types, personalities, egging and proper feather colors...I still get birds sometimes with feather color problems and have made a point to not breed these birds forward to avoid messing up otherwise good genetics, but honestly, feather color and pattern is lowest on my list of what I consider important in a bird. Go figure...it is usually the most important first impression or disqualifying factor but does the least to benefit a backyard bird.![]()
Thanks. I figured that the feathering would be the most difficult and headache inducing. When showing birds looks are everything.