The majority of newbies, in my opinion, are unable to see the significance and effect of Bitcoin's potential and the need to have trust in its sustained rise. As a Bitcoin investor or evangelist, I must first state that you must acknowledge and embrace its ideals before making an investment. I suppose the first thing an investor should think about is that. You also mentioned that it's crucial for investors to have a strong faith in Bitcoin, believing in its future growth and realising that it's preferable to choose long-term growth over short-term gain when it comes to Bitcoin investment.
your faith in bitcoin is more like the prerequisite thing that gets you started in bitcoin investment, once you have started, you should not be talking about not having too much faith in bitcoin or not, what you should be talking about is how you can effectively remain invested for the long run and set parameters in place that will help you get the best from your investment...
You can start investing in bitcoin with little faith and still succeed. I don't us to attach too much religion to financial investment because that can bring some form or careless behavior with the belief that their faith will correct such actions. What is needed to succeed in bitcoin is not all about faith but following the right approach which is investing with only discretionary income, setting up emergency funds and ensuring you plan long term. Even if you are new to bitcoin and do not have much faith in it but you follow this step, you will succeed as a bitcoin investor. Key point is, don't over complicate the process.
I believe that what you mean is confidence and not faith. Of course, it's a norm that in the beginning as a new investor, you will have some doubts about bitcoin since you don't have the knowledge of bitcoin. Any new investor who has little confidence in bitcoin should start by investing with little amount of money as low as $10 and above for one year and above while he builds his confidence by learning and from his experience by in the market as he buys regularly every week consistently and persistently.
With time, after he must have increased his confidence in bitcoin, he can increase the amount of money from his discretionary income that he has been using to buy to invest aggressively in order to cover up all those times that he was buying with little amount of money. It's better that you start and have a little size of bitcoin in your portfolio than not having at all due to lack of confidence in bitcoin. Consistency and persistently accumulation of bitcoin is what really matters and not by how much that you are using to invest in bitcoin weekly.
I think someone can start with the little they have if after Investing it won't choke them later but if someone knows that if after Investing in Bitcoin their responsibilities and there needs will choke them then I will suggest they don't invest in Bitcoin at all because it makes no sense after investing you went back to sell your coin because of your inability to take care of your needs and wants.
It's good for someone in this situation to find a second means of income and cut down his expenses. The second means of income can serve as his discretionary income which he can use to start his bitcoin investment.