Need help with prisons on 900xp!!

I have a 2011 900xp and I removed the head to replace the valve stem seals, I also pulled the jug off to get to the Pistons to remove them and clean them. Now I am stuck with trying to get the piston and rings back in the jug/cylinders without taking the whole notor apart. Is there any tricks or advice yall can give me about how to go about it?