How can I get my 6 week old to fall asleep on her own...?

This is a follow up to another question I asked earlier... I have a 6 week old baby girl that will only sleep if myself or her father are holding her or if she is in her swing. I'm looking for some tips on getting her to fall asleep on her own. If I lay her down alone in her crib or binet she just kinda hangs out in there for a while and then starts fussing. Is there anything I can do to help her get to sleep without being held or swinging in her swing? I have a mobile on her crib, I swaddle her, give her a pacifier, even have one of those sound machines that has plays a recording of a heartbeat. And I still can't get her to doze off! Any advice? Be nice please! I got some rude comments before because I mentioned I let her sleep on my chest at night otherwise we would never get more than a hour of sleep at a time! I'm a first time mom!