Most of my smart chums that were still waiting on the sidelines bought in at approx. $420 in the belief that it wouldn't go much lower, if at all. 

Do not invest more than you can afford to lose.  If you should decide to invest anything at all, buy it and hold it.  At some point you'll (probably and hopefully) have enough value to sell some, recoup your original fiat investment and retain a little coin as a long term investment.  Do not watch the charts every day and do keep your emotions in check.  If you're not a regular trader, charts can be very dangerous and very false friends.  Buy, hold, sell a bit when you can and keep some for the future. 

That's my advice.

Also, don't listen to anyone's advice on the Internet.