I'll bet your dental gear, and experience, helped immensely.
after doing a bunch of these surgeries, i don’t think it would be wise for somebody with zero background in anatomy, surgery or having a job that required finite hand skills. the testes in a chicken run literally along the inferior vena cava. if you make one mistake, the chicken will bleed out instantly. i sacrificed a cockerel that wasn’t doing well in order to dissect and learn the anatomy. i also did this procedure with one incision on each side. for me, as a beginner, trying to “tease” the lower testicle around the IVC wasn’t worth the risk of severing the vessel.
this being said, i think anybody could do this. the things i would recommend would be to have decent instruments (the rib spreader, hemostat and forceps are the most critical), good lighting, an assistant, some kind of magnification (it could be one of those desk lamps with a magnifying glass), and practice first on a cockerels you are culling.
i also removed food 36 hours in advance and water 24 hours. i removed food on Wednesday at 6:30 am, then water at 6:30 pm, then caponized on Thursday around 5:30 pm. I put leg bands on the capons and put them in a separate area to heal for 3-4 days.
one last piece of advice in regards to practicing...you want to be able to do this procedure in the least amount of time. there will be minor bleeding and the longer you “dig” around the bleeding will make it more difficult to see the testicle as well as the blood will clot and get in the way. i would aim to be able to do this in about 60 seconds per side if you are doing 2 incisions. when you make the incision, incise deep enough to get to the abdominal cavity...on 6 week old cockerels...this was approximately 1/4” or so. i made the incision about 3/4-1” in length and spread the ribs approximately 1/2-3/4”.
if anyone wants to learn this or wants any help, please feel free to message me. aside from doing this on dual purpose meat birds, this would also be a way for people who live in areas that don’t allow roosters to keep their roosters as a pet...just a thought.