Price is any time to up and down. So it not easy to check the price. People check the price before invest or sell any coin check the market price. Market price information help for plan to work. It good future invest. So choose the best coin in the market then buy and hold it.
Before investing it is very important for sure to know what is price situation in market only then invest and invest only in good coin which is promising and which can help you get profit, it is best time to invest price is not high selling now can only give you lose but holding with patience can give profit for life time and next time you will be able to invest with your profit, so selling now will be foolish decision I think.