You can go live and start very small, ONLY IF YOU HAVE AN EDGE on your trading, only if you already master a strategy or two with good expectancy.
If you go live small without an edge, proven strategies and discipline, you´ll start losing small, every day, building up frustration, anxiety, doubts about your skills and future as a trader, risking yourself to a hulk day. You will blame your "psychology", your "mindset", but I have news for you about "psychology":
Said by a Trading Psychologist. So yes, trading small without an edge won't end giving you an edge. Trading without an edge, thinking you have one, will cause serious damages to your self esteem and mindset, even you could become traumatized, and that will be very hard to overcome.
There is a lot of self pressure and self deception to go live before one is ready, avoid that. Imagine if an airplane trainee ask to fly a 777 full of people because "sim is like a video game". If you don't have the edge, the discipline and the patience in sim, you won't have that either trading your hard earned money.