I need to claim some forks from various coins and crypto's. One issue I can foresee, is that the dates when I purchased bitcoin, litecoins, and Ethereum, it is various. Then I have moved coins around from different wallets and exchanges.  I have no clear dates on what is what and it has moved around.

How do I claim forks?
Is it hard to claim forks?
Is there risk claiming forks?
Is there a charge for claiming forks?
Are there forks that are worthless?

More. Info. Please!!!!