Usually it is best that whatever you can invest should be not more 2% of your capital in your trading. Best to use 1% or even lower if you are new to trading.
Controlling your emotions at the earliest stage would be the best course of action, that way, you do not have to handle the difficulties in trading in later stage.
The difficulty level is different for everyone, I only believe that one who will spend quality time reading and understanding everything about trading, wont have much issues. Practice will surely him become profitable.