I'm actually without a phone right now (broke it 3 weeks ago). So I desperately want to get an iPhone 6. Usually I can wait for upgrades and I have patience. But this is the first launch where I'm anxious, as I actually need one. So I appreciate everyone on here being very helpful and giving those of us that are new to launch some insight/tips.
I would have never have known to use the app. So I'm really grateful to you guys.
Happy to help, I've been pre-ordering iPhones every year ever since the iPhone 4. First, pre-orders start at 12 AM PST, so jot that down and find out what time that is on your time zone and be ready. I used to wake up 30 mins before they start the pre-orders but over the years 10-15 Mins is enough. Have three tabs open, one is for the Apple.com website, the second is for your carrier, and the third one is for forums where you can follow other apple fans trying to pre-order the iPhone too (I follow MacRumors). The last one is very important because it can help you troubleshoot issues you might run in to.
Second, make sure ALL your info is updated on both your Apple ID account and your carrier account. This will make checking out a much faster and smoother process. It is critically important that you use the same ADDRESS for both your Apple ID and your carrier billing address. It needs to MATCH! This is so important! It happens every year, I've read about people pre-ordering their phones and using their work address for the delivery (but their home address is on the bill) because they're going to be at work. Then they find out the hard way that Apple has decided to cancel their order completely and they have to start from scratch. If you really want to deliver the device to your work place, change the address on your carrier's billing (and possibly your bank too). Your carrier may be flexible on this rule, but on the Apple website, it's a risk.
Third, practice doing a check out on either sites so you know the basic steps. Know ahead of time what information you'll need to type to speed things up. If you're using the Apple.com website to order and you're using your carrier upgrade, you need to be aware of the "Checking with your carrier" page. This is the page most people have trouble with. After you put in all your carrier info, Apple will check with your carrier if you're eligible for an upgrade. This page will tell you what it's doing and you'll see the Safari loading wheel. If this page hangs for more than 5 minutes, close it and start all over. It shouldn't take more than a minute to check if you're eligible, so if it hangs, just close it and start all over. If this happens too much, it's time to go through your carrier instead.
Finally, after you checked out and paid your order and you get the "Order Complete" page. Don't celebrate just yet. Check the e-mail that you used when you ordered the phone and MAKE SURE you get that Order Complete e-mail from Apple or your carrier. Over the years I've heard of people thinking their order went through, but never received the e-mail. Or, it's common to hear that they went through all the steps, but when they clicked on "Checkout", the page went blank and didn't load anything ever again. Or they get the infamous "We're busy, we'll be back" page from Apple after they check out. It happens and as long as you get the e-mail with your order confirmation, it went through and you can go back to sleep.
Applecare, it's optional. If you're planning on adding it to your order, do it right then and there before you check out. Otherwise you'll have to wait till you get your phone and then visit an Apple Store within 30 days of activation to get it. Do it right then and there. You can call Apple and have them add it to your order, but you run the issue of getting put at the end of the pre-order line when a rep does that. I've read over the times of people getting on the backordered list because they did this. Or worse, an inexperienced rep will cancel your first order and then just make you a new one with Applecare included. In that situation, you're at the back of the line.
I'm a bit anxious myself this year because I'm planning to get the unlocked version this time. So, I'm not going to run through the whole activation part of ordering, but Apple has NEVER offered unlocked version for pre-orders. This is new to me, and I know the T-Mobile version is available on the site right now, but who knows how that will function. I may even have to go through my carrier and get it that way. I'm sure I'll be here on NeoGaf this time to see how you guys do this coming Friday.