G.P.
Babywise worked great for me, and yes, at 6 weeks I did let me son cry it out. He was sleeping through the night by 10 weeks. By now, you probably know the pain cry versus the "you just put me down and I'm not happy" cry, so you can respond appropriately. You don't have to follow everything exactly, but it is a great place to start.
It sounds like she has gotten used to you holding her. That isn't a bad thing, and if you can carry her around all day, and choose to, that is fine, but not everyone can do that, or chooses to. You may try warming up the crib with at heating pad before putting her down. Swaddling does wonders. The happiest baby on the block is great for soothing, just don't let her fall totally asleep before putting her down. Babywise also helps you schedule the nap in there. They may not like it at first, or may want to just sleep, but it helps to regulate them, and makes it easier to teach them night from day.
Good luck, and if you have any questions about BabyWise, feel free to contact me.