You can not serve two masters at the same time, because you will be committed to one than the other. If you are trading and investing at the same time, there's high possibility that you will be liquidated in trading and you will go and dip hand into the bitcoin that you are investing because it is always lying in your wallet to tap some bitcoin to trade with. You will believe that you will make profit and put it back but gradually, you will lose all your bitcoin investment to trading because trading is same with gambling and you will run at loss in the long run.
What are you saying? Hehe 
when we live in a society where you can't survive with just one stream of income let alone relying solely on a long term investment like Bitcoin. A newbie who is just starting out will find this advice too discouraging. One can still be a trader and investor at the same time and there are many of them out there who are making it big running both at the same time.