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Investors don't need to clear their doubts before they begin their investment, they can start right away and learn to trust in the network as time goes by. Sometimes over confidence make people to take the wrong decisions and at the end blame bitcoin for their own actions. However the market volatility isn't a new thing and most people with their confidence gets into the market aggressively of which when price start moving against their direction they start to panic and could go as far as selling their bitcoin.Experience and mentality will be formed when someone is directly involved in the market. They will never gain experience and develop their investment strategy without making mistakes - then they will become mentally better and no longer affected by short-term price volatility. All new investors may panic when the market goes against them - but over time the mentality will develop and they will know how to anticipate it.
One of the best methods is to consider a DCA strategy - no matter who you are, experienced or not, DCA can help you from time to time. There is no high pressure to do it all the time especially if you have consistent cash flow - but you can still do it whenever you have cash.