I was the same way...I have three kids and only started co-sleeping with my third (he just turned 2) and I really wish I'd done it with all of them! Plus you're really lucky that your DH is supportive!
I did a lot of reading and some of the things that I found to help me feel comfortable are from several sources like:
1. An excerpt from article by mother/baby sleep expert James J. McKenna:
For as far back as you care to go, mothers have followed the protective and convenient practice of sleeping with their infants. Even now, for the vast majority of people across the globe, "co-sleeping" and nighttime breast-feeding remain inseparable practices. Only in the past 200 years, and mostly in Western industrialized societies, have parents considered it normal and biologically appropriate for a mother and infant to sleep apart.
In the sleep laboratory at the University of California's Irvine School of Medicine, my colleagues and I observed mother-infant pairs as they slept both apart and together over three consecutive nights. Using a polygraph, we recorded the mother's and infant's heart rates, brain waves (EEGs), breathing, body temperature, and episodes of nursing. Infrared video photography simultaneously monitored their behavior.
We found that bed-sharing infants face their mothers for most of the night, and that mother and infant are highly responsive to each other's movements, wake more frequently, and spend more time in lighter stages of sleep than they do while sleeping alone. Bed-sharing infants nurse almost twice as often, and three times as long per bout, as they do when sleeping alone. But they rarely cry. Mothers who routinely sleep with their infants get at least as much sleep as mothers who sleep without them.
In addition to providing more nighttime nourishment and greater protection, sleeping with the mother supplies the infant with a steady stream of sensations of the mother's presence, including touch, smell, movement, and warmth. These stimuli can perhaps even compensate for the human infant's extreme neurological immaturity at birth.
Co-sleeping might also turn out to give some babies protection from sudden infant death syndrome (SIDS), a heartbreaking and enigmatic killer. (read more here:
http://www.naturalchild.com/james_mc...ime_story.html )
2. And there are a lot of articles on the Mother-Baby Behavioral SLeep Lab site (James McKenna's site)
http://www.nd.edu/~jmckenn1/lab/mothering.html
On a personal note, once I brought the baby into our bed, I realized that all the negative bromides about not getting enough sleep with a baby in the house just didn't apply to us. Once we embraced co-sleeping, I felt a weight lift off of me...like I could just relax and do what felt right and natural. it was such a "duh" moment for me!
Anyway, whatever you decide, I wish you well!!