Well I made the standard mistakes and them some unique, giant mistakes.
standard: getting the tiny, unventilated yet expensive prefab coop (called the half-flap hen house.). Quickly realized it made a half decent brooder with modifications for ventilation, but couldn't even accommodate 2 small hens as a coop. Also ended up with loads of roosters, but found good homes for all (except Adam Chicken, my avatar, who I am keeping.)
Giant mistakes (chronologically):
*My two day old blue copper marans had pasty butt. I rinsed her off and then decided to put some tea tree oil rinse on her irritated vent (thinking it works when my dog has a paw irritation.). She keeled over 2 minutes later and died within the hour. I still think about you, Blue.
** Forgot to count my chickens after letting them out of the coop for a walk at 6 weeks. My cream crested legbar, Woodstock, went in the coop, and then snuck out again. I didn't see that she was out, and went inside the house to make them a snack. Then I let me standard poodle into the yard. I really miss you, Woodstock!
*** I used a penknife to strip a thickly insulated wire to make my electric fence. Cut off the top of my left index finger to the bone, requiring a skin graph and tendon surgery. The tendon was "shredded" and may not fully recover. It has been 9 weeks since the injury and i can finally take off the splint once in a while -- will need a lot of OT.
Of course, they are all worth it! I love my chicks.
standard: getting the tiny, unventilated yet expensive prefab coop (called the half-flap hen house.). Quickly realized it made a half decent brooder with modifications for ventilation, but couldn't even accommodate 2 small hens as a coop. Also ended up with loads of roosters, but found good homes for all (except Adam Chicken, my avatar, who I am keeping.)
Giant mistakes (chronologically):
*My two day old blue copper marans had pasty butt. I rinsed her off and then decided to put some tea tree oil rinse on her irritated vent (thinking it works when my dog has a paw irritation.). She keeled over 2 minutes later and died within the hour. I still think about you, Blue.
** Forgot to count my chickens after letting them out of the coop for a walk at 6 weeks. My cream crested legbar, Woodstock, went in the coop, and then snuck out again. I didn't see that she was out, and went inside the house to make them a snack. Then I let me standard poodle into the yard. I really miss you, Woodstock!
*** I used a penknife to strip a thickly insulated wire to make my electric fence. Cut off the top of my left index finger to the bone, requiring a skin graph and tendon surgery. The tendon was "shredded" and may not fully recover. It has been 9 weeks since the injury and i can finally take off the splint once in a while -- will need a lot of OT.
Of course, they are all worth it! I love my chicks.
Some of my chickens take me hunched over as a 'new and exciting roost to check out' and poop down my jacket.
...so much hogwash and gimmicks to be found online and in the words of people who don't have any idea. Find and get to know people that actually have experience and wisdom on the subject, even if its not what you want to read or hear.
They'll be your chicken best friend and you'll sleep better at night. 
I mean its OK if you like a layer of silt, dandruff and dried poop coated nicely on everything you own even a year later I'm still finding pockets of it. 
(Its so hard!)
Its VERY OK if my chickens don't have pedigree toe nails, doesn't make them any less than amazing.

