Try cutting some off while he's sleeping.
Or provide a distraction such as tv or give him a tablet that and distract him with it by letting him watch youtube videos or playing his favorite game on it.
After he's immersed into the game or video then start cutting.
If that fails just have his dad "if he's around" help hold him down while you get it cut.
He's the child and you're the parents. He has to know who's boss and it's not him.
It is common for young children to hate or be scared of getting their cut.
Even if they were ok about it before.
Try not to stress about it too much. There is alot of stuff that goes on in the toddlers head!