I coped with the labor as long as I could (I, too, was going for natural.) Until everything went downhill and they had to move me out of the birthing centre... I didn't use anything for the contractions. If I was standing, I walked around a lot in little circles during a contraction. I don't know why, but it helped. Or if I was sitting down, I rotated my hips a lot, which also helped. I also had a bathroom with a bathtub attached to the room (nice!) and I had like four lavender baths... which were SO GOOD. Since I wasn't giving birth in them, I was allowed to have them a bit warmer than if I had been in the birthing pool.
I was awake so long and so unbelievably tired after 35+ hours, but still coping, however was getting just a tad antsy because everything was moving so slow. The midwife was surprised I still hadn't touched the gas and air, so she said to just give it a try.
Man, I wanted to use nothing in labor... but that stuff was great. I felt the contractions completely while having them, however because you have to breathe in the gas and air during the contraction... it helped me pace my breath and just zone in on breathing during them and keep my focus as they got stronger. Once the contraction subsided and I took the mouthpiece away... I felt goo-o-od. I felt like my voice was 10 octaves lower and I was saying some ridiculous things, and I knew I was saying silly things, so I'd get a bit giggly. My mother and husband got some well-needed humor as they were also sleep deprived, because neither had ever seen me on anything like it or act that way (I don't drink... I don't do anything.)
My husband was eating Ben and Jerry's and I had to have some while using it. The combo was a nice one! I didn't use the gas and air until I was over 6cm.
I have heard it works for some and not for others. I dug it, though!