Dude why we should never sell bitcoin? If you wont sell that, you would not get any profit in it and you will lose assests. If you are afraid to sell it set a maximum value that when that coin reaches that kind of amount you are ready to sell it. Me personally when talking about invest you must see the peogress of that and you should earn so that you will  be motivated to try anothing like related to bitcoin. Also you must be aware to the news concerning about bitcoin for us to decide very well because we invest