You have to be extremely patient and diligent at times when things seem to bounce around. Build this up and I cannot stress how much patience you need and how you have to have a steady hand.
I'll tell you now that I've gone in with the mindset that I may very well, lose everything I put in but everything comes with research and everyone's risk tolerance is very different.
Even the best hedge fund managers make mistakes. There are very subtle clues for every stock out there that determines movement in the stock price. Some less subtle than others. Sometimes changes can come at a sudden announcement. Sometimes you kinda get the idea a company isn't gonna put out some good news like a company releases a quarterly earnings report that missed targets. Suddenly stocks plummet.
There are simulators for download to get you familiar with all the ins and outs and terminology with trading. I would seriously start there just to get familiar with how to make moves. Research a company very diligently before investing. Take a look at their financial statements and what their competitors are doing. You want to find out absolutely everything about a company if you want make any money investing on your own.
Don't go into doing something like this. I somewhat agree that you should pick a stock that sells products you like. If you are already familiar with their product, you know at least a little about the company who built it. I started with conservative investments in insurance companies as they offer some type of safety net like dividends. I made a few grand and I moved onto banks made a few thousand more, I'm simply building my experience. I go into investing simply to make a few extra bucks not to get rich fast.