Hi Becky -
This is quite common, you're not alone! Why not try changing his diaper in the same place each time for a while - the changing table if he's not too big for that, and everything is in reach so you don't have to turn your back etc. My 1 yr old son is fine on his changing table, because he's so used to it, although he's a challenge on the floor, and won't stay still. We make it fun to be on there - I blow rasberries on his tummy, and make silly faces, tickle him, and basically make him laugh. I also look him in the eye and tell him what we are doing as we do it. This works wonders with my son in almost any tricky situation. I find really looking at him in the eyes and talking/reasoning with him as if he was an older child works very well. If he's upset about doing something, just explaining in a calm voice why we have to do it - i.e. he'd be very uncomfortable if we left his dirty diaper on him, and he'd get a diaper rash etc., etc. Something about the tone of the voice, and the way you treat them with respect seems to get through even if they can't understand everything you are saying! Also, I've tried introducing the potty to my son. If I can tell he's about to do a poo, I say let's sit on the potty, ok? And then put him on there. If I get the timing right, and he has a bowel movement I make a big fuss, we clap hands and I tell him what a good big boy he is. He also sits on there just before bath time, because I noticed that he was peeing almost everytime he got in the water. So, when the water is running, he sits on there, and he usually has a pee. Again, we make a big fuss, and he looks at it, and feels really proud. Perhaps adding this dimension gradually, without pressure, just almost for fun, might help take the focus off of the diaper changing as well, and if anything help you need to change them a bit less. One more thing, if he's very active, and standing, and making some progress on the potty, maybe think about using pull up pants? You can then just pull them up when he's standing, and no worries about making him lie down if he's just too busy to want to do that. Good luck with it!
A.