As crazy as it sounds, me telling you what you should be comfortable with, I still feel like I need to warn you. Losing $150 is very painful for anyone without a $100,000 or larger account. I'm guessing you're gonna be trading $10,000 or so. Well, it won't take long till you are down a few percent already, and then bad things start to happen in your brain.Yes, that ES risk is just too big right now. Last week, I took a $500 loss on 2 trades. I was able to keep on scalping and recover. If I was trading the MES, that loss could have been $150 (3 contracts) which is an amount I am comfortable with.
I'll have to return to ES when ranges reduce some.
Why start out trading 3 contracts anyway if you aren't scaling? Spend just one week trading one contract, and if it turns out well, you can go to 2 for the next week and be up to 3 for the third week. But I will bet you that once you go live, lots of different things will start to happen.
Risking 5 points per trade, which is what it sounds like you are doing based on on losing $500 over 2 trades with ES, is plenty. This is $25 with the micro ES, and it means that even if you lose 4 trades in one day, you are down $100. Since you're comfortable losing $150, this means that the next day you will be able to trade with no hang-ups at all since you won't have even lost $150. Honestly, just prove to yourself that you can survive one week trading 1 micro contract and then re-evaluate.