One thing that is far much worse than paper losses is selling the shares, booking the losses planning to invest elsewhere and later use the same money to "buy back" your shares only for the prices to head north in the meantime!!!
A smart investor BUYS shares at a discount! Not SELLING his/her shares at a discount hoping for even better discounts!! Utalilia kwa choo.
If you have hard cash though, you are justified to invest elsewhere in the meantime.
Never count on making a good sale. Have the purchase price be so attractive that even a mediocre sale gives good returns.