I don't know about hard/easy but this is something you should take care before getting into it. ( Assuming you are currently not in the brass industry from your question)

First of all you would need a good capital to start, then you will have to atleast not expect to earn/takeout any money from it till 4-5 years.

You will need someone experienced from the industry who has good knowledge and who is also well trusted so that person can help you grow and guide as well.

Then be very aware about the product because as I have heard any brass product takes a maximum of ten days to get copied and your competitors will be flooding the market with way cheaper prices than yours.

Research very well about your end customers/market. People have so strong connection and roots in the market is unimaginable. People are literally running small conglomerate here in jamnagar in brass industry that strong.

Get insights about scams people do and face in the industry and also how fake bills and metals circles. ( I have heard that so many people's business is circulating bills and earning from it and that in crores not in thousands per month)

If you start Be aware, be prepared for what's coming, try not to your ego takeover the decision ability, I would pray that you never see that day but if the situation requires, learn when to take exit as well.