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It's hard but not necessarily impossible. Here's Ethereum's sharding FAQ:

Hi Dennis, a friend recommended you to me for Ethereum smart contract audit, are you open/available for a project?

Willing to talk at least, how do I contact you?

The fact that it isn't working yet, if it ever works at all, is a good indication of the problems faced.

Yes it's not implemented yet. I think Vitalik said the first phase of sharding is planned to be implemented later next year. So we'll see.