Difficulties dividing rhubarb

I didn't think this would be hard and I have read various instructions, but having just tried it's not going to be as easy as I thought.

I tried to dig it up and it won't budge.  Do I dig deep all round it until I can get some movement?

Because I couldn't move it, I thought maybe I could chip off some buds to replant, but I couldn't work out which /where are the buds.  How do I identify the buds?

And thirdly, if I get that far, what is the best implement to divide it, as I'm not particularly strong?  Can I saw it?

Thank you for the advice.  Rhubarb is up and divided.  Three buds (I hope) in the ground and one in a pot in the greenhouse (a forcing experiment).  If anybody is still reading this thread, can I throw the rest of the old rhubarb roots on the compost?