Nothing, there is nothing that anyone should worry about. If anything, you might have a day of confusion if the fork went really off the chain, lol. There is nothing that is going to hurt your wallets, although a trusted online wallet is the easiest place to ride a fork out as that leaves the site to deal with any issues and not you. But, make sure that you really trust a site, because potential scammers love to use excuses like this is bail with their clients wallets.
To me i do not have any specially planning, but going to hold my bitcoin . I in fact in favour of long term investment and therefore do not giving preference to sell my bitcoin. I am holding my bitcoin at least for next 3 to 4 years, because bitcoin has a very bright future and its price will continue increasing for a long time. Therefore i think long term investment is more profitable as compare to short term investment.
Well in my own i am planning to hold my bitcoin but some of them i need to sell few bitcoin before the fork just to getting benefits of the price today and saving my profit because there are some chance that bitcoin can be drop without notice because its unpredictable so selling bitcoin if you already gain profit and save it to use to buy bitcoin once if the price is cheap again. just scaling up for buying low and sell high basic way of gaining profit..