You probably need to take it a little slower. I can recommend Karen Pryor's click for grooming if you are going to groom your own dog at home.
Re treats, whilst you are actually cutting the hair initially you may find it more effective to spread some Philadelphia or pate into a lid so they can lick it off instead. Then have a break, a play, rinse and repeat.
There are also some threads on here previously about how to cut paws (don't cut in between pads, cut level with and use thinners for between tops of toes). Good luck!