I have no problem replacing the tube, getting the tire back on. It's putting the rear wheel back on. I have been to at least 3 classes, where I manage to do it, and practice every winter, but the last time I practiced, my DH came home to find me sitting on the front step, crying, with my bike in pieces.
Yea, I know the tricks (putting the chain on the biggest cog, big chain ring), but I can't manage to lift the bike with one hand, pull back the deurailler with the other and get the chain back on. More than once, I've hurt my back trying to do so!
Well, I have had only had flats twice while out on the road in ten years. Thankfully I was with someone else at the time. Pretty much, this is why I don't do long rides alone. And I pump my tires every time I ride, don't ride in the rain if I can help it.
I know, I'm hopeless.