If you really want to play, might I suggest you pick up an older working Android phone cheap from eBay or Craigslist? I'd recommend you look for a model by the same manufacturer as your current phone because even though the specifics will be different, the process will be similar enough to let you know if you want to do it. For example, Samsung's flagship, the S4 is around $520.00 on Amazon while you can pick up an old working Galaxy S for between $50 and $75 depending on the condition. Then you can root and flash and modify without worrying about messing up your current phone.
Once you get a feel for it and are comfortable with the steps and procedures, then you can make an informed decision to root and flash your daily driver.