Steps to follow before and while following the Arch wiki

Make sure you have a working computer other than the one you're installing Arch Linux to for browsing the Arch Wiki on. Either that or print it off the pages you know you'll need so you have it handy for reference. You could always use your phone, but reading a lot on a small screen can be cumbersome from all the scrolling than on a normal sized screen.

Before you attempt to install 

If you never touched Linux it would probably be best to use an easier to use Linux distribution such as Manjaro before you try any DIY Linux distribution. You also should be comfortable with the terminal. Manjaro is fairly easy to install and have a working system you could start with that. Another one is Ubuntu. Read the Installation guide once or twice before you attempt anything to familiarise yourself with the material so you dont go in blind. Look up anything you dont understand.

While googling for help, dont be tempted to follow an installation guide other than the official one and dont use the included installation script. This is important if you ever need help from the official support channels, they wont help you if they know you used an automated tool or that you followed directions other than the official ones they provide on their official wiki.

Get familiar with your system. Know what the model name of your computer, if it's a laptop or prebuilt. Even if it is, you should also know what the model name of the the motherboard is and the serial number. you should know is what kind of CPU you have. Also what video card you have and how much system memory you have. Once you know the model names of your hardware you should write them down somewhere. This way if you have any hardware or driver related issues you have something you can Google. 

Get the model name of any external devices you have, even though most of those should work out of the box it's good to have the model names of all of these on hand. Even though most stuff is baked into the kernel there's an odd thing that doesnt work and you have to compile for. 

Explore what software you'd like to use. If you're coming from something like Ubuntu or Manjaro, you might want to find out what you were using on that for certain types of software because it'll make the installation process a lot easier because you'll be using mostly familiar stuff.

While you you install 

Read everything carefully and fully, read to the end of the section before you type any commands. Make sure you understand what the command is supposed to do. If you dont understand something it's better to not do it until you understand.

The commands for the initial install you should especially be careful because they're case sensitive, read them twice, and read what you type into the terminal twice before you hit the enter key.

Even though installing Arch Linux can be a pain, it's worth it because you learn things about Linux that you can use elsewhere.