Day trading is good and was a good source of income for many in times past, technical analysis these day fail often because of those who manipulate the market, it is made worse by exchanges putting up incorrect data to traders.
If you get it right and can make some money then it is a good thing as you can keep earning some money which can help you to atleast pay some sort of bills and this will also act as a part time income and you can support your family as well.
Not a god idea. As stated before, the market is quite often subject to manipulation, so if you're a regular trader with just enough funds, then it's not a reliable source of steady income.