Installation is simple. Again, before you start, make sure you have everything off of XP that you want to keep.
You might want to make sure you already have an internet connection so it can update everything as it goes instead of making you go back to do that later.
Anyway, boot the system live, set the internet if needed, click on the "Install" icon, and answer some questions. The most difficult part is at the disk usage.
It will ask you if you want it alongside XP, but XP is dead, so I wouldn't worry about that.
It will ask you if you want to use the whole disk. I'd choose that one.
Ignore the 'something else' option.
After that it's a simple case of answering various questions. Default ones for language, keyboard, probably even time zone, etc are fine. Username and password you'll need to set. But there's a tick box there that lets you login without a password. If you aren't doing anything sensitive that you'd worry about other people seeing, you can go with that. But if there's anything you'll need to protect, leave that alone and provide your password every time you login. Just make sure you remember the password you set if you decide to auto-login because you're probably going to need it at some point for installing something or configuring something (wireless internet, installing software and doing updates, for instance). There are ways to reset it if you forget what it is. But that's not something you want to mess with if you can help it.
That's pretty much it until it's done and you're ready to boot to the installed system.
After you're that far, if you need anything else just ask.