look, ok, this might sound a little bit weird to most people here but:
socrates once said: we only learn from the mistakes that hurt us.
find a level of money that hurts you loosing, but not to much that it endangers your wellbeeing.
demo youll learn nothing.
if you go in with too much it will hurt u too much, youll drop out.
if you really want to have some sort of future in trading, it must cost you in the beginning enough that it hurts you. otherwise you wont learn. if you arent able to take losses then you should turn around and find another profession.
take a look at your targets. what do you ant to achive with trading? quit your job have more money then before you had? evaluate what is this "chance" worth to you.
people who have a paycheck of 3000/month take a loan from bank to open a company with 100.000. they go all in, they risk all, they quit their job and depend only on tht new company without knowing if it will ever pay off. Why? because they want to be their own boss and they speculate that if it turns out good theyll earn much more in future.
thats how much their "dream" is worth to them.
threat trading like a real company, dont take it too easy but for god sakes please dont take a mortgage to trade. that above was just an example.