For this reason, I think it is better to invest little by little instead of investing all the dollars at once. What is your opinion?
We make bad decisions in trading. This method saves you from losing everything. Losing everything may be worse because you may have no means to get your money back but you only lose a little amount if you and have your other part of them money. And when you get profit you can double it by adding using the other divided small amounts.
Instead of demo for a long time these small amounts can be used to protect from the loss that may be encountered during that first time.