How can I replace the SSD in my 2017 RZ09 Razer Blade?

Hey folks, just purchased this as-new (got a great deal!) but 256gb is looking woefully inadequate for my needs. I'm looking to invest in a 1TB internal drive - I hate external ones with a passion as I travel loads and always lose them!

My questions are:

1) Can anyone tell me the exact type of SSD I need? The differences between NVMe, M.2 etc etc are all a little too much for me to suss out! I figured maybe this: https://www.mrmemory.co.uk/ssd-upgrades/razer/laptop/blade-14-2017#!samsung-970-evo-m.2-nvme-ssd

2) Are there any good USB external adapters that I can backup my current drive with?

3) I've seen videos of SSD replacements on the 2016 model - looks straightforward to do. Is it the same with the 2017 model?

Thanks!

Matt