Bad idea to sell and plan to sell all as the plan to exit.  You will find more often then not you have mistimed the selling and wont catch the best prices to exchange to FIAT at.   Unless you have to have FIAT at that moment to pay a bill, delaying is often no bad thing scale out during a rise should bring a higher average sale.   Same kind of reasoning as scaling in and buying in a regular way when trying to capture the lowest pricing, we have a personal perspective and value for BTC but the market has its own momentum usually greater weight and overshooting too low and too high.
  The whole concept of selling is for people who are not especially involved or interested in BTC long term, there is a ton of speculators in the market who treat this asset as just a number.  Decide which side of the trade you are on because so far those who thought more of BTC have been the people who gained by selling just a little of what they kept back when the prices were lower.  If you switch sides and sell all then you are the speculator and have to work harder imo.