The more genes sometimes the harder it gets but it can also be difficult even with a few genes depending on what you are pairing, that's why having a good eye and asking for second opinion from knowledgeable people working with said genes is very important.
Also important is to under sell an animal rather than over sell it.
Sell what you are sure at 100% and if someone gets a surprise of an additional gene they will be happy, if you do the opposite, not so much
Sent from my SM-G900V using Tapatalk