If you must buy Bitcoin then it should be today, if you have your discretional income ready buy Bitcoin immediately and keep buying,no dulling. The truth you need to know for yourself is that the price of bitcoin wouldn't wait for you or anybody regardless. What's the points of selling when you haven't started  or don't you think it's too early for such. If you're interested in buying Bitcoin, don't give a  second thoughts about it, buy right way and you wouldn't regret your decision. While investing in Bitcoin, you need to understand the basics about it and how it works. Always approach the market with a long term plan to become a potential investor, yeah you need to be consistent in your approach in buying and accumulating Bitcoin using your discretional income for purchase. Infact just keep buying and buying until you reached over accumulation target and hold for a long term period of at least 4-10 years or more. The goal here is to keep buying and holding for as much as you can for the long term .