How to access new mobile phone service. Help needed

When I got a new phone I bought it while staying with my daughter so she could both help me choose and then set it up for me afterwards. She transferred everything from my old phone for me. I'd never have managed on my own so I know how you feel. Unfortunately she now lives overseas and if I have issues she tries to explain things over the phone but sometimes I struggle to follow her instructions. I'm sure she things I'm a complete idiot but I'm just not very tech savvy! I can usually find a friend to help me with things if I'm really struggling but I often get there by myself in the end - it just takes me rather a long time. Many of my friends know even less than I do so I guess they must struggle with things too.
As more and more things go online it isn't going to get any easier. I need to make a list of all my queries for when my DD comes to the UK in September!

First, make sure your new phone is turned on and connected to Wi-Fi. Open the camera app and scan the QR code that you have on your laptop screen. This should start the setup process for your new service. If it doesn’t work, you might need to use a special app from your new provider to scan the QR code. The instructions should have been in the email, so check the entire email carefully, including any attachments or links. The PUK number in the email is for unlocking your SIM card if it gets locked. If you're still having trouble, try searching your provider's website for QR code setup instructions or their customer service contact info.