Zolos are VERY high quality slings. I have heard that some are harder to adjust than others. If you go to the Zolo site, Darien has posted some videos with instructions. Or, you can buy the tummy to tummy DVD from here at ATB. If has instructions for pouches, RS, MTs and wraps.
ITA with PP, RS were always easiest for me to nurse in. I also did pretty well in the wrap when DD got older and I was better at wrapping, but with pouches I couldn't really do it until DD could sit on my hip and nurse like that (she'd kind of scrunch down and nurse--it didn't look very comfy, but she didn't complain, LOL).
Serenity
SAHM to three Army Brats
Jack 7, Ellen 5, Claire 2 (and #4 EDD 10 Mar)