Sleep Training a 6 month old

Well ladies, I must admit - I expected to post a couple of these before I went to bed last night. I was sure I would need the extra motivation - but I must say, my little sleep trainer fooled us all! I read the book, I called my bro for tips because he has done this before, talked to friends, family, etc. We all expected one very long night. The minimum was 2 hours of screaming before she finally gave up. So, at 9:45, i brought her in her room. We put on a fresh diaper, a onsie and a sleep sack. We read a book and said our prayers. Then, I laid her down and said, "Goodnight Cadence. I love you" and went on my way. I stood at the door for a couple of minutes before I heard the screams from the other side. 5 minute wait begins. at 10:07, i checked on her. Laying in the middle of her crib, screaming away. I did exactly what they tell you to do. Showed neither anger nor concern. Simply made eye contact, and said, with as straight of a face a brokenhearted mommy could have, "Cadence, go to sleep" and walked right back out. Then begins the 20 min wait. It's truly amazing how long 20 mins can be. This is were the doubts start to sit in. Can she do this? Is she ok up there? Is she hurt? Will she sleep without her paci? Bad mom tessa you are a bad mom for letting her scream this way!!!! At exactly minute 20, I started my journey upstairs...when over the baby monitor i hear.....nothing. No whimpers, no moans...silence. At this point, even dh is wondering if she is just choking or something....Mind you, there is nothing in the crib but a baby and a sheet on the mattress. The bumper is weeved in and out of the posts so there is just no way she could have pulled it onto her face...but choking on spit, throw up, anything that could have entered her mouth in the past 20 mins. Here comes a mommy and daddy delima. The book CLEARLY states, that at the end of a 20 min period, if the crying has stoped, not to go in there. Shes falling asleep on her own. It's what you want - if you interupt this process now, there could be more crying. But its only been 25 mins....not even close to the 2 hrs we expect....so i give in. I'll b the worlds worst mom if I don't check on her and soemthing IS wrong. As I walk into the room, I see cc is def not where I left her. She had pushed herself, still on her back, all the way against the crib. Her head was against the only exposed post on that end of her crib...and then the FTM worries kick in - did she hit her soft spot? Is she going to be ok? We had just suffered thru 25 mins of pure agony - I don't want to wake her and make it all have happened for nothing. I slide her down into the middle of the crib, and she barely even reacted. When dh and I went to bed, we opened her bedroom door and ours. Monitors on, and waited to see if she would cry for us in the middle of the night because no ones there to rock her, because she has no paci, because her brain is going to swell out of her skull because she rammed her head against the posts!!! I did check on her at 4 am, and she was still right where I left her and totally asleep. Then, at 8 am, we woke up, totally refreshed and wondering...why didnt she cry? did we really in fact hurt her tiny little head? As soon as I mumbled - "Go check the baby, she hasnt woke yet" - cc make a bit of a cry over the monitor. Our precious angel had offically put herself to sleep, and stayed asleep for 9 and a half hours. She woke up full of smiles to see us and is sooo happy right now.