My girl is DEAD! HELP!

OKay, I need some help from all of you experts out there. I have never been a car guy, and I don't know much about fixing things, but here is my situation.

I have had my 2010 3rd Gen for a little over 2 years. I use her for work (Uber), and after putting over 50K miles on her since I bought her at 140K, she's starting to act up.

It all started last week, when my tire pressure light came on. In my ignorance, and not knowing that it was the tire pressure light, I checked my oil first to see what was up...it was bone dry...at less than 9,000 miles since my last change (I have NEVER had to top off my oil before an oil change before). I took her over to O'Reilys to have them run a diagnostic, and to get a quart of synthetic. The read came back with a couple of hits on the spark plugs, and that one of my coolant reservoirs was low (even though it's right at the fill line, there is still at least a gallon of fluid in the damn thing). So I have been driving this past week, busy as hell, knowing that I need to probably change my plugs, and hoping I would have the time this week to do it.

I got home at 3am today, and she was running fine. I went out at 3pm to go work, and she wouldn't start. She powers up, the radio works, windows, blower, etc, yet, most of my dash lights are all on, and I keep getting the "check hybrid system" notification. Also, my power button glows orange, instead of green. Everything powers on, but the engine won't kick in.

I called AAA to come out to my apartment to see if they can see what's up. He checked the 12V, and it's fine. He inflated my tires, and the engine still won't come on (I thought maybe because the tires were low, it would trigger the computer to not engage the engine). He tried jumping her, but to no avail.

Now, my questions are:

1. If the spark plugs are that far gone, would it just stop overnight, and keep the engine from turning over?

2. If not, what else could it be?

3. I ended up going over to O'Reilys to buy a set of NGK iridium plugs to replace them myself. This will be my first time ever changing over my plugs, so what do I need to do? I have found videos on You Tube that show step by step instructions, though I have read that some people use anti-seize grease, others say not to use it. Also, are there any other connector lubes that I should be using as well. I hope that I have the right sockets for the job, though I really need to know what else I might need.

$40 for a set of plugs to do it myself, versus upwards of $200 or more to get them changed at the dealer...it's a no brainer, though I just want to make sure I'm doing it right and not mess up anything in the process.

Any help would be really appreciated, guys. Thanks.

 

$125 just to have them look at it...no can do...

 

I moved to Atlanta in April...surprisingly not that many specialists here, and the ones I spoke with are charging more than dealership prices... ...I am more than a little freaking out right now. I can't afford to bring her in...I really want to try and change these plugs which fingers crossed that they are the issue...and I need my car so I can make money because I'm broke... :